Question

【题目】I won’t tell the student the answer to the math problem until he______ on it for more than an hour.

A. has been workingB. will have worked

C. will have been workingD. had worked

Answer 1

【答案】A

【解析】

试题 考查动词时态。句意：我直到他已经做这道数学题超过一个小时才告诉这个学生数学答案。根据“for more than an horn。”知选用现在完成进行时态。

考点 : 考查动词时态