【題目】—Listen! There someone at the door.

—It must be your sister.

A. is; knocking B. is; knock

C. are; knocking D. are; knock

【答案】A

【解析】

試題分析:句意:――聽!有人正在敲門。―― 肯定是你的妹妹。不定代詞作主語,謂語要用三人稱單數(shù),someone是不定代詞,因此要用there is;Listen!提示下面的動作正在發(fā)生,所以用現(xiàn)在分詞knocking做定語修飾someone。故選A。

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