问题
选择题
—May I speak to your manager Mr.Williams at five o’clock tonight?
—I’m sorry. Mr. Williams ________ to a conference long before then.
A．will have gone
B．had gone
C．would have gone
D．has gone
答案
答案：A
then指代at five o’clock，由语境可知是将来时间。将来完成时表示将来某时之间或某动作之前已经完成的动作。