概要：当 need， want， require， worth(形容词)后面接doing也可以表示被动。如：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 (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 clean 则也为正确答案。
辨析：need/want/require,标签：四年级英语辅导,http://www.youer8.com
当 need， want， require， worth(形容词)后面接doing也可以表示被动。
如：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 (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 clean 则也为正确答案。