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 by then.”
A．will have gone
B．had gone
C．would have gone
D．has gone
答案
答案：A
这题考查时态， by“到什么时候为止”，和相应的完成时连用，根据上下文，时间是：by then指“到今晚五点为止”，所以用将来完成时。