"The effect of this medicine ______ by midnight," the doctor told Emma"You had b

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问题 "The effect of this medicine ______ by midnight," the doctor told Emma"You had better not try to read tonight."

选项 A、will wear off
B、wears off
C、will have worn off
D、will be worn off

答案 B

解析当表示普遍规律时应该用一般现在时，因此B项为正确答案。

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