be advisable for I don’t think it advisable that Tom _A____ to the job since he has no experience.

I don’t think it advisable that Tom _A____ to the job since he has no experience.  

I don’t think it advisable that Tom _A____ to the job since he has no experience.

advisable 后面要用虚拟语气 原句应该是...Tom should be assigned to the job...
但是should 可以省略，也就是A选项
至于其中涉及的语法，主要就是虚拟语气的一些标志词
动词的话你知道的，如suggest advise insist等等不赘述了
说一下形容词，一种是上述动词的形容词，有“可取的，适合的”意思，如advisable就是advise的形容词，又如insistent等等，还有一种是特殊的，表语气的形容词，有“重要的，必要的”如important necessary 或者“惊讶，奇怪”如strange 或者“自然的”如natural
记住以上特例，如果虚拟语气完全不明白，建议还是买本语法书，仔细地学习
这句话的意思是：我不认为tom应该被分配去做这项工作，因为他没有经验

I don't think it advisable that Tom be assigned to the job since he has no experience.

think 后不是从句。而是think sth adj 。think的一种语法。认为什么怎么样。后可加形容词，名词。

I don't think it advisable that Tom__th the job since he has no experience.

这个是虚拟语气...
advisable之后的that从句应用虚拟...(should)do..
这里是被动 因此是C...
至于什么词后接虚拟 你可以找本语法书来背一下 这个没有捷径

I don’t think it advisable that Tim _______ to the job since he has no experience.

选C 因为前面有advisable，表示这是虚拟语气。
提姆没什么经验，所以我不建议让他来做这项工作。

I don't think it advisable that Peter——to the job since he has no experience．

我认为彼得不适合被安排做那件事，因为他没经验
这里的since是因为的意思，不是自从，所以A不对，是完成时的话，since是翻译自从。
不是B，根据句子的意思，peter 已经被分配了，所以不是将来式。
不是C的原因跟不是B的原因一样，peter早就被分配到这个工作了，所以被人才发表评论说他没经验不适合，所以也不是用一般时。
答案：D

急问！I don not think it advisable that Tim _ to the job since he has no experience. A.is a...

C. be assigned，句意为：我并不建议让Tim去做这项工作，因为他没有什么经验。前有advisable，要用虚拟语气，should be done，其中should可以省略。
相同用法的词还有：advice,suggest(建议),insist,demand,mand

I don't think it advisable that Jack_____the job since he little experience.

为虚拟语气，完整形式为think (sb.should do)
括号里为从句

这个句子里有个advisable（可劝告的）
当句子里包含建议，劝告，坚持等意思时从句用should be/do,should可以省略
这里C就省略了should

i don't think it advisable that him __ to the job since he has no experience

像这类词语，advice 啊，。suggest之类的名词。或者动词，引导宾从要用虚拟语气，should do 形式should可省略
参考
一想要(desire一宁愿(prefer)二命令(order. mand)三建议(advise. suggest. propose)四要求(demand. require. request. ask.insist)中，无论主句谓语动词为何种时态，从句的谓语动词都用："should + do"。should可以省略。eg： He suggested that we (should) takethe teacher's advice. He insisted that we (should) takethe teacher's advice. He demand that we (should) takethe teacher's advice. He ordered that we (should) takethe teacher's advice.

i don't think it advisable that Tim be assigned to the job since he has no experience

你说的是省掉that的宾语从句
it可以做形式宾语 如I found the game interesting可以变成I found it interesting
不是省掉is 而是压根不用系东西 即主语+宾语+形容词