问题: 英语
Jack () yet, otherwise he would have telephoned me.
A mustn't have arrived
B can't have arrived
解答:
Jack (B) yet, otherwise he would have telephoned me.
A mustn't have arrived
B can't have arrived
must have done：对过去动作的肯定推测，只能用肯定句中。否定形式为can't／couldn't have done,疑问式为:Can／Could...have done？
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