By the following semester, it is likely that the old professor______on the campus of Califor nia University for two decades.

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问题 By the following semester, it is likely that the old professor______on the campus of Califor nia University for two decades.

选项 A、will have to be teaching
B、will have been taught
C、will have been teaching
D、will be teaching

答案C

解析 by the following semester“到下学期”,应用将来完成时态。句中用将来完成进行时,指“到下学期时那位老教授就已经在加利福尼亚大学执教20年了(并且还要继续教下去)。”
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