Question

I think students______ to do homework with friends.

1. A.
   is allowed
2. B.
   are allowed
3. C.
   should allowed
4. D.
   should be allowed

Answer 1

D
试题分析：句意：我认为不应该允许孩子们和朋友们一起做作业。结合语境可知从句为虚拟语气，主语是动作对象，故用被动语态。选项B描述的是客观事实，故选D。
考点：被动语态
点评：此类题型主要是确定句子主语与谓语动词的关系。如果是主动关系则用主动语态，反之如果是动宾关系，则用被动语态。