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题型：单选题题类：模拟题难易度：普通

黑龙江省哈尔滨市南岗区2020年九年级英语中考二模试卷

—When did the classroom have a power cut?

—This afternoon, while we ___________chemistry experiment (试验)

A、have done B、are doing C、were doing

举一反三

It ___________ heavily when I left school yesterday.

While she TV, she a sound outside the room.

My brother while he his bicycle and hurt himself.

他们那时不在打排球。

They {#blank#}1{#/blank#} volleyball at that time.

Jack ____ for a friend from England at the airport when Emily dropped by his house.

I happened to see Jack and Mary this morning. They ____ kites in the park at that time.

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