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When he is free, he often helps his parents ________ some housework.

A. does B. do

C. doing D. did

B

【解析】

試題分析：句意：當(dāng)他有空的時候，他經(jīng)常幫他父母做家務(wù)。help sb （to） do，幫助某人干某事。 結(jié)合句意，故選B

考點(diǎn)：考查非謂語動詞的用法。

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