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    【题目】We urge ________ extreme caution in ________ use of this medicine, which has not been officially approved yet.
    A.an; the
    B.an; 不填
    C.不填; the
    D.不填; 不填

    【答案】C
    【解析】考查冠词。句意：我们强烈建议使用这种药要极端谨慎，这种药还没有被正式批准。caution为不可数，不用冠词修饰；第二个空特指这种药物的使用。故选C项。

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