【題目】Our teachers are always busy __ our homework and they try their best to help us.

A. correctB. correctsC. correctingD. to correct

【答案】C

【解析】

句意:我們的老師總是忙于批改作業(yè),他們盡最大努力幫助我們。

本題考查非謂語動詞。correct是動詞原形;corrects是一般現(xiàn)在時的第三人稱單數(shù);correcting是動名詞;to correct是動詞不定式。be busy doing sth忙于做某事,故用動名詞correcting。故選C。

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