【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(yǔ)動(dòng)詞。correct是動(dòng)詞原形；corrects是一般現(xiàn)在時(shí)的第三人稱(chēng)單數(shù)；correcting是動(dòng)名詞；to correct是動(dòng)詞不定式。be busy doing sth忙于做某事，故用動(dòng)名詞correcting。故選C。

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