"May I speak to your manager Mr. Williams at five o’clock?""I’m sorry. Mr. Williams ______ to a conference long before then."

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问题 "May I speak to your manager Mr. Williams at five o’clock?""I’m sorry. Mr. Williams ______ to a conference long before then."

选项 A、will have gone
B、mustn’t follow
C、couldn’t have been following
D、shouldn’t have been following

答案A

解析
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