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)。
sth ~ sb sb be ~ed at sth (doing sth.). / to do sth / that sth be ~ ing His not passing the exam surprised us very much. / We were surprised at his not passing the exam. To our great surprise , he didn’t pass the exam. / The heavy snowfall took us...
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