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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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