when have you heard from your改错改错when have you heard from your br_英语解答

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：489 ℃　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