第33题: [单项选择]"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 参考答案:A 答案解析:根据题意,可见before then相当于before five o’clock tonight,表示的是在将来某个时间之前要完成的动作,因此此处谓语动词要使用将来完成时。例如:The railway