He______for six years by the time he takes his examination.

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问题 He______for six years by the time he takes his examination.

选项 A、had been studying English
B、will have been studying English
C、studied English
D、studies English

答案B

解析 由by(the time when)引导的将来时间句,其主句时态应使用将来完成时态或将来完成进行时态。
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