【題目】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】

試題分析：考查冠詞。句意：我們強烈建議使用這種藥要極端謹(jǐn)慎，這種藥還沒有被正式批準(zhǔn)。caution為不可數(shù)，不用冠詞修飾；第二個空特指這種藥物的使用。故選C項。

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