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【題目】It’s good ________ our parents do some cleaning.

A.helpingB.to helpC.helpsD.help

【答案】B

【解析】

句意:幫助我們的父母打掃衛(wèi)生很好。

考查動詞不定式。helping doing形式;to help 動詞不定式;helps單三式;help動詞原形。根據句意可知,空處應是動詞不定式做真正的主語,句中it是形式主語,故選B。

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