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单选题
Taken in time, the medicine can be quite ______.
A
effective
B
affected
C
efficient
D
sufficient
参考答案
参考解析
解析：
句意：如果按时服药的话，这种药疗效不错。effective表示“有效的”，符合句意，故选A项。。affect影响。efficient高效的。sufficient足够的，充足的。
句意：如果按时服药的话，这种药疗效不错。effective表示“有效的”，符合句意，故选A项。。affect影响。efficient高效的。sufficient足够的，充足的。
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