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

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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用一般现在时,因此B项为正确答案。
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