Question

— “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

Answer 1

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。