this sentence requires ( ).A.improve B.improving C.improvement D.improved

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this sentence requires ( ).A.improve B.improving C.improvement D.improved
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this sentence requires ( ).A.improve B.improving C.improvement D.improved
this sentence requires ( ).
A.improve B.improving C.improvement D.improved

this sentence requires ( ).A.improve B.improving C.improvement D.improved
选B
因为require是主动表被动,所以要用-ing 形式.

名词形式 C

选B,require和need类似,后接动词ing形式或不定式,this sentence requires improving=this sentence requires to be improved.这个句子需要被改进