【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】句意：——聽(tīng)！有人正在敲門(mén)�！隙ㄊ悄愕拿妹�。根據(jù)There……someone……可知，此處應(yīng)該是運(yùn)用句型：有人在做某事There be sb. doing sth.;不定代詞someone是單數(shù)，因此要用there is，又由于listen可知，動(dòng)作正在進(jìn)行，所以現(xiàn)在分詞做伴隨狀語(yǔ)，并且與someone是主動(dòng)關(guān)系，應(yīng)填listening，故選A。

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