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题型：单选题题类：常考题难易度：普通

Sally took a photo of her friends while they computer games.

A、play B、are playing C、have played D、 were playing

举一反三

When we ____ home last night, we saw a strange object in the sky.

Tom's mother heard a knock on the door while she _______ in the kitchen.

—Could you tell me where you found Miss Gao just now?

—Certainly. In the principal's office. They ________ happily at that time.

—Why are you so late? I've been here for almost an hour and a half.

— I'm terribly sorry. Just as I ________, Mr. Smith asked me to send an e-mail for him.

—Were you at home at 9 o'clock last night？

—Yes, I a shower at that time.

Both my mother and my sister _________________TV at half past eight last night.

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