问题补充:
How dirty the windows are! They really require .
A. to clean
B. being cleaned
C. to have cleaned
D. cleaning
答案:
A. to clean
B. being cleaned
C. to have cleaned
(答案→)D. cleaning
解析:考查动词用法。require doing = require to be done需要(被)做,根据句意选择D。
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