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第1题

Much ______been said about the problem but nothing _______ been done so far A.has， had B.had， has C.had， had D.have,
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第2题

The scientist ___ many of his thories on different animals A.spoke out B.made out C.tried out D.took out
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第3题

If you see a doctor leaving a house, you may ___ that someone in the house is ill A.deduce B.reduce C.detect D.defin
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第4题

When you’ve finished with that book, don’t forget to put it back on the shelf, _____? A.do you B.don’t you C.will you
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