题目内容
It is obvious to the students _____ they should get well prepared for their future.
A. as B. which C. whether D. that
D
句意:显然,学生们应该为他们的未来做好充分的准备。that引导主语从句, 在从句中不作句子成分, it是形式主语。as 引导定语从句或状语从句; which 引导名词性从句时, 意为: 哪个(些); whether是否, 在此句中如用此词, 则语义矛盾。
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