问题
选择题
I became a teacher in 1993. I _______ for 13 years by next summer.
A．has taught
B．will teach
C．has been teaching
D．will have been teaching
答案
答案：D
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I became a teacher in 1993. I _______ for 13 years by next summer.
A．has taught
B．will teach
C．has been teaching
D．will have been teaching
答案：D