We urge ________ extreme caution in ________ use of this medicine, which has not been officially app...
2022-10-09 08:27:39 30次 2017届江苏南通中学高三上期中考试英语卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
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; theD. 不填; 不填
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