问题标题:
Weoftenhelptheoldman()?A.todosomecleaningB.cleanedC.cleansD.cleaning
问题描述:

Weoftenhelptheoldman()?A.todosomecleaningB.cleanedC.cleansD.cleaning

陈庆章回答:
  helpsb(to)dosth   A符合,BCD都不是动词原形不符合题意.   应选A
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