in summer holidays 因为在暑假有很多天,不是确定的某一天,所以前面不用介词on,而介词on是指在确定的某一天,像你所说的on Monday,就是确定在星期一,所以用on.另外在暑假还可以说during summer holidays 意思是在暑假期间
是on summer holidays还是in summer holidays?
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