单选题：The research is so designed that once _____ nothing can be d..

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The research is so designed that once _____ nothing can be done to change it.A．beginsB．having begunC．beginningD．begun

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She hurriedly left the room as if ___.A．she angryB．was angr..

She hurriedly left the room as if ___.A．she angryB．was angryC．it was angryD．angry

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So suddenly ________ that people had no time to escape. [ ]..

So suddenly ________ that people had no time to escape. [ ]A. did the earthquake happenB. the earthquake happenedC. was the earthquake happenedD. the earthquake was happened

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Deep in the mountains _____some people who witnessed that hi..

Deep in the mountains _____some people who witnessed that historical event. [ ]A. living B. are living C. have lived D. live

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Some of you may have finished unit one. _____ , you can go ..

Some of you may have finished unit one. _____ , you can go on to unit two. A．If you mayB．If you doC．If notD．If so

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Only whenearly，enjoy the fresh air.A．do you get up;you ca..

Only whenearly，enjoy the fresh air.A．do you get up;you canB．do you get up;can youC．you get up;can youD．you get up;you can

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