题目内容

2.-Listen!There         someone         at the door.
-It must be your sister.(  )
A.is; knockingB.is; knockC.are; knockingD.are; knock

分析 -听!有人正在敲门.
-肯定是你的妹妹.

解答 答案:A 根据There…someone…可知,此处应该是运用句型:有人在做某事There be sb.doing sth.;不定代词someone是单数,因此要用there is,又由于listen可知,动作正在进行,所以现在分词做伴随状语,并且与someone是主动关系,应填listening,故选A.

点评 本题主要考查实义动词的现在分词及there be结构的综合运用.

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