单选题
"May I speak to your manager Mr. Smith at four o"clock this afternoon?"
"I"m sorry. Mr. Smith ______ to a conference before then."
A、
has gone
B、
will have gone
C、
had gone
D、
would have gone
【正确答案】
B
【答案解析】
本题主要考查将来完成时态。将来完成时态中时间状语非常明显，常用by+将来时间，或由by the time…，before或when 等引导的副词从句。
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