【题目】By next month he ______ in the big city for five years.
A. has worked B. has been working
C. works D. will have worked
在线课程【答案】D
【解析】
考查将来完成时。句意：到下个月，他将已经在这个大城市工作五年了。由时间状语By next month，可知句子为将来完成时，其构成为 ：主语 + will + have + done。所以为will have worked。故D选项正确。