Question

It is obvious to the students ______ they should get well prepared for their future.

1. A.
   as
2. B.
   which
3. C.
   whether
4. D.
   that

Answer 1

D
试题分析：考查主语从句：句意：对学生来说很明显他们应该为将来做好充分准备。从句式上可以看出，it是形式主语，that引导的是真正的主语从句，句型是：It is +adj +that从句。选D。
考点：考查主语从句
点评：如果主语从句缺少主宾表，用what连接主语从句，如果不缺成分，用that连接，引导主语从句的that在从句中不做成分，只起到连接的作用，学生要会分析句子成分。这里还涉及到it做形式主语的用法。