单选题
9.
The experiment requires more money than______.
A、
have been put in
B、
being put in
C、
has been put in
D、
to be put in
【正确答案】
C
【答案解析】
more…than为比较形式,其中than为关系代词,相当于than what。且前半句为一般现在时,所以答案为C。
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