题目内容
19.-Oh,Mum,just a few minutes.-Hurry up,Harry,or by the time you pack your belongings,the flight ____.( )
A. | has left | B. | will have left | C. | had left | D. | will be leaving |
分析 ---妈妈,再等一会.
---快点,到你打包好,飞机都起飞了.
解答 答案:B
by到…为止,经常和表示动作的动作的完成时连用.本句中by the time后面的时间状语从句you pack your belongings使用了一般现在时代替将来,后面的主句要使用将来完成时,表示到将来的某个时间要完成的事情.
点评 将来完成时主要考察学生在具体语境中应用该时态,注意时间状语by+将来时间.
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