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题型：单选题题类：常考题难易度：普通

过去进行时（专题）

While we _______, the teacher came in.

A、to talk B、were talking C、talk D、are talking

举一反三

_______ you _______ basketball at four yesterday afternoon?

While he _______ for the bus, he was reading a newspaper.

It _____ hard when I left my office.

We along the river when it rained.

It as the medical team made its way to the front.

Were they playing the guitar?

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