语法学习技巧|need/want/require/worth

注意：当 need, want, require, worth后面接doing也可以表示被动。Your hair wants cutting.你的头发该理了。The floor requires washing. 地板需要冲洗。The book is worth reading.这本书值得一读。典型例题The library needs___, but it'll have to wait until Sunday.A. cleaning B. be cleaned C. clean D. being cleaned答案A. need +n /to do，need + do，当为被动语态时，还可need + doing. 本题考最后一种使用方法，选A。如有to be clean 则也为正确答案。典：done，"不可能已经"。must not do 不能（用于一般目前时)。