单选题
By the end of this year Mr. Smith ______ in our company for exactly three years.
A、
is working
B、
has worked
C、
will work
D、
will have worked
【正确答案】
D
【答案解析】
[解析] 考查将来完成时。句子中有by the end of this year，故应用将来完成时，其基本构成为will have done。
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