The windows haven’t cleaned for a long time. They need .A. to cleanB. to be cleanedC. clea

问题补充：

The windows haven’t cleaned for a long time. They need .

A. to clean

B. to be cleaned

C. cleaning

D. B and C

答案：

A. to clean

B. to be cleaned

C. cleaning

(答案→)D. B and C

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