Question

【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

Answer 1

【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。