问题
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__ you are tired, you had better sit down.A.because ofB.AsC.ForD.when
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The American Congress corresponds______the British Parliament.A.onB.toC.forD.with
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_____ the saying goes,practice makes perfect .A.SinceB.AsC.ForD.Like
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Do you think money is the answer _____ happiness?A.ofB.asC.forD.to
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He is a leading authority___plant diseases.A、onB、aboutC、forD、of
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55._________A. onB. withC. aboutD. in
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