when have you heard from your改错改错when have you heard from your brotherhave they alrady begun the new service
问题描述:
when have you heard from your
改错
改错
when have you heard from your brother
have they alrady begun the new service
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