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当 need， want， require， be worth后面接doing时，表示的是被动意义。例如： Your hair wants cutting. 你的头发该理了。 The floor requires washing. 地板需要冲洗。 典型例题 The library needs___， but itll have to wait until Sunday. A. cleaning B. be cleaned C. clean D. being cleaned 答案A. need （实意） +n /to do，need （情态）+ do，当为被动语态时，还可need + doing. 本题考最后一种用法，选A.如有to be cleaned 则也为正确答案。 | 
