问题
选择题
The reform has changed the whole nation. It cannot remain ________ it used to be.
A．what
B．where
C．which
D．when
答案
答案：A
A 考察表语从句。此处remain是一个联系动词，其后选用what引导一个表语从句，同时what在从句中作为be的表语。
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