1 a 因为现在完成时 加一段时间 用for引导一段时间 用since加过去的一个时间点 by the end用的是过去完成时 until是直到的意思 就像第二题里
2 c until解释为直到 这句话的意思是 不要急 公交车是不会开得 直到所有人上了车
3 a how表方式 意思是 告诉我如何发一封邮件 这是我第一次发邮件
1.He hasn't heard from his friend _____last month.
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