题目内容
例：A computer can only do you have instructed it to do．
A．how
B．after
C．what
D．when
答案是C．
－May I speak to your manager Mr．Williams at five o’clock tonight?”
－“I’m sorry, Mr．Williams ________to a conference before then．”
[ ]
A．will have gone
B．had gone
C．would have gone
D．has gone
答案：A
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