问题
选择题
The floor is dirty and it requires _________.
A．being cleaned
B．clean
C．to clean
D．cleaning
答案
答案：D
句意：地板很脏，需要打扫。需要做某事，用require doing或require to be done,所以选D。
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The floor is dirty and it requires _________.
A．being cleaned
B．clean
C．to clean
D．cleaning
答案：D
句意：地板很脏，需要打扫。需要做某事，用require doing或require to be done,所以选D。