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第1题

_____ they are doing has never been done before. （2分） AThat BWhat CWhy DWhether
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第2题

This is the problem _____ we have no good solution as yet. （2分） Ato that Bwhich Cfor which Dto which
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第3题

If you want to learn something, you had better pay _____ in class. （2分） Acare Brespect Cattention Dnotion
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第4题

All I’m trying to do is to _____ why your conclusion has not improved. （2分） Alook for Bfind out Csearch for Dget in
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