【題目】They ______ busy doing their homework.

A. is B. am C. are D. /

【答案】C

【解析】

句意:他們正忙于寫作業(yè)。主語(yǔ)they是復(fù)數(shù)形式,系動(dòng)詞應(yīng)用are。故選C項(xiàng)。

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