高等继续教育 / 护理英语I
正确率：100%
题型描述: 单选题
This medicine works on your sore throat, you have to keep it in your mouth ( ) it is melt.
A.when
B.until
C.for
D.if
This medicine works on your sore throat, you have to keep it in your mouth ( ) it is melt.
A.when
B.until
C.for
D.if
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