【題目】They must ____their homework today.

A. finishB. finishes

C. finishing

【答案】A

【解析】

句意:他們今天必須完成作業(yè)。

根據(jù)must情態(tài)動(dòng)詞,后用動(dòng)詞原形;finish完成(動(dòng)詞原形),finishes完成(單數(shù)形式),finishing完成(動(dòng)名詞);故選A。

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