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    【题目】We urge ________ extreme caution in ________ use of this medicine, which has not been officially approved yet.

    A. an; theB. an; 不填C. 不填; the D. 不填; 不填

    【答案】C

    【解析】

    试题分析：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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