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。
典:done,不可能已经。must not do 不可以(用于一般现在时)。
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