i don't think it advisable that him __ to the job since he has no experienceA is assigned B will be assigned C be assigned D has been assigned为什么选 be assigned

i don't think it advisable that him __ to the job since he has no experienceA is assigned B will be assigned C be assigned D has been assigned为什么选 be assigned
i don't think it advisable that him __ to the job since he has no experience
A is assigned B will be assigned C be assigned D has been assigned
为什么选 be assigned

i don't think it advisable that him __ to the job since he has no experienceA is assigned B will be assigned C be assigned D has been assigned为什么选 be assigned
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.command)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.

前面有advisable，作宾补，宾语从句使用了虚拟语气，即should do should可略。

C advisable 是advise的形容词形式，从句用虚拟语气，属于advise的相关词形，从句谓语用should +V,或V；这里是被动，所以是C

I don't think it advisable that he (should) be assigned to the job....
it 形式宾语
that- 真实宾语从句，受advisable 影响，从句的动词用虚拟，并省略了should，留下了原形，看上去很别扭，对吗？但是正确的。
advisable, 可取的，明智的，理性的

c，虚拟语气

advisable后面的从句需要用虚拟语态should+动词原形，should可省略。类似用法还有suggest, propose, recommend, request, require, ask（请求）,order 等

我认为派他去做那个工作是太不明智的了，因为他毫无经验可谈。be assighed 某人被派去做某事之意。

C be assigned，虚礼语气省略了should……