题目内容
Being a teacher always encouraging students to think for themselves, I won't tell them answers until they __________ on a math problem for more than an hour.
| A.have worked | B.will have worked |
| C.will have been working | D.had worked |
A
解析试题分析:考查时态:句意:做老师总是鼓励学生独立思考,直到他们这道数学题算了一个多小时我才告诉他们答案。主句是一般将来时,从句用一般现在时或现在完成时代替将来时,或将来完成时。选A。
考点:考查时态
点评:这题考查的是时间条件状语从句的时态问题,此类的状语从句不能用将来时,用一般现在时或现在完成时代替将来时,或将来完成时。
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