How dirty the windows are! They really require .A. to cleanB. being cleanedC. to have clea

发布时间：2020-08-16 13:59:10

How dirty the windows are! They really require     .
A. to clean
B. being cleaned
C. to have cleaned
D. cleaning

网友回答

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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