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— “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 goneB．had gone
C．would have gone　D．has gone
A

這題考查時態(tài)， by“到什么時候為止”，和相應的完成時連用，根據上下文，時間是：by then指“到今晚五點為止”，所以用將來完成時。
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