He _______ here for 20 years by the end of next month.
He _______ here for 20 years by the end of next month.
A、had worked
B、has worked
C、will have worked
D、will work
【正确答案】：C
【题目解析】：时间状语是by the end of next month，应该是将来完成时，所以选C

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