问题
单项选择题
A cold medication that has expired ______.
A．looks different
B．is 10 percent effective
C．remains somewhat effective
D．shouldn't be taken whatsoever
答案
参考答案：C
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A cold medication that has expired ______.
A．looks different
B．is 10 percent effective
C．remains somewhat effective
D．shouldn't be taken whatsoever
参考答案：C