Question

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

A. as
B. which
C. whether
D. that

Answer 1

答案D
考查名词性从句中的主语从句用法。此处要分析句子结构，看出it为形式主语，代替that they should get well prepared for their future，并且本句意思完整，故选D。