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【题目】—What _________ your teacher _________ now?
—He is cleaning his office.
A.are, doing
B.is; doing
C.are; do
D.is; do

【答案】B
【解析】考查现在进行时。【现在进行时】表示说话时正在进行或发生的动作,也可表示当前一段时间内的活动或现阶段正在进行的动作.结构:助动词 be ( am / is / are ) +现在分词。句意:你的老师在做什么?他在打扫办公室。老师是第三人称单数,使用助动词 is。所以答案是 B。

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