【題目】Listen! Someone at the door. Please go and answer it.
A.knocks
B.is knocking
C.has knocked
D.was knocking

【答案】B
【解析】句意:聽!有人在敲門。請去看一看。像Listen,look, now等表示現(xiàn)在時間,要用現(xiàn)在進(jìn)行時態(tài),現(xiàn)在進(jìn)行時的構(gòu)成:be+doing;根據(jù)Listen!可知現(xiàn)在的時間,要用現(xiàn)在進(jìn)行時態(tài),結(jié)合句意和語境可知選B。

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