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3．The classroom is very dirty．It needs_________．（　　）

A．

clean

B．

cleaned

C．

cleaning

D．

to clean

分析教室很臟，需要被打掃干凈．

解答答案：C．考查動詞的固定搭配．句意"教室很臟，需要被打掃干凈．"need to do 是需要做某事的意思；need doing 是某事需要被做的意思，不需加be動詞，直接表示被動含義．根據題干The classroom is very dirty．It needs_________．可知是教室很臟，需要被打掃干凈．故選C．

點評掌握need的用法及其區別，根據具體內容作答．

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