问题
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It is found that many Americans are not doing enough to care _____ their teeth.A、/B、f
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Some well-known scientists believe that there is not enough oxygen on Mars to ______ human
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After all, many people do not believe that flying saucers, ______ unidentified flying obje
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________(47)A.Experts say that we cannot do that
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________(48)A.Experts say that we cannot do that
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________(49)A.Experts say that we cannot do that