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题文

______did the rainstorm come, Mr. Liu?

While we_____a chemistry lesson yesterday afternoon.(  )

A.

When; have had

B.

When; were having

C.

While; are having

D.

While; have

科目 英语   题型 选择题   难度 中等
知识点: 特殊疑问句 过去进行时
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