问题
选择题
_______ is mentioned above, the number of the students in senior high school is increasing.
A．It
B．That
C．What
D．As
答案
答案：D
考察定语从句。关系代词As指代后面一句话的内容在句中作主语。句意：正如上面所提到的那样，高中学生的数量一直在增加。
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