题目内容
19.直到妈妈回来,他才来上学.Hedidn't come to schooluntil his mother came back.
分析 didn't,until
解答 答案:didn't,until.这里需要表达出直到…才.用not…until,再者这里是说过去的事情,用一般过去时,前面的come是实意动词,借助于did构成否定,故答案是didn't,until
点评 not…until是一个常考点,别忘了时态的分析
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