What ______ at seven yesterday morning?
A．is she doingB．was she doingC．did she doD．does she do
B

試題分析：句意：昨天早晨七點，她正在做什么？結(jié)合語境可知本句描述的是過去某時正在進行的動作，故用過去進行時態(tài)，選B。
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