题目内容
（请给出正确答案）
[主观题]
"May I speak to your manager Mr. Williams at five o' clock tonight？""I'm sorry. Mr. Willia
"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
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