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第1题

The sun heats the earth, _________ is very important to living things.A. that B. what C. which D. where
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第2题

He keeps _________ at himself in the mirror.A. to look B. looking C. look D. looked
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第3题

Before she left on the trip, she __________ hard.A. trained B. has trained C. would trained D. had trained
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第4题

I’m tired. I __________ working very hard.A. have B. have been C. had D. has
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