“Why hasn’t he turned up yet?” “He ________ have missed the train, but I’m not quite sure.”
“Why hasn’t he turned up yet?” “He ________ have missed the train, but I’m not quite sure.”
A、must
B、may
C、can
D、should
【正确答案】：B
【题目解析】：根据but I’m not quite sure.，可推出此处为不太确定的猜测，因此B符合题意
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