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The teacher is already standing here. Do you know when she ______?
A.comesB.came
C.is comingD.was coming
B

试题分析:句意:老师已经站在这儿了。你知道她是什么时候来的吗?come来,是一个动词。根据句意可知,老师现在已经站在这里了,因此来这个动作应该是过去发生的,应该用一般过去时,故选B。A是一般现在时,表示经常性或习惯性的动作;C是现在进行时,表示此刻正在发生的事情;D是过去进行时,表示过去某时正在发生的动作。
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