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【题目】—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】

试题分析:句意:――听!有人正在敲门。―― 肯定是你的妹妹。不定代词作主语,谓语要用三人称单数,someone是不定代词,因此要用there isListen提示下面的动作正在发生,所以用现在分词knocking做定语修饰someone。故选A。

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