when have you heard from your
改错
改错
when have you heard from your brother
have they alrady begun the new service
人气：397 ℃ 时间：2020-03-20 22:53:24
解答
把第二个have改成had.
这个是在考复合句的时态,因为当你收到哥哥的来信时已经是发生在过去
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