题目内容
The floor is dirty and it requires _________.
| A.being cleaned | B.clean | C.to clean | D.cleaning |
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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题目内容
| A.being cleaned | B.clean | C.to clean | D.cleaning |