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

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