27.He hasn’t heard from his friend __________ last month.

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27.He hasn’t heard from his friend __________ last month.
A.since
B.by the end of C.for
D.until
别误导人

A
“自从上个月以来,他还一直没有收到他朋友的来信呢”
since “自从...以来”,要求前面的主句用现在完成时.
by the end of ...到...末为止,by the end of last month 只能用于过去完成时.
for 后面必须接一段时间,而 last month 不是时间段,是从上个月某一时间算起,是点的概念.
until 后面接 last month ,可以,但是,必须用一般过去时.
希望我的回答能够帮到你,

27.He hasn’t heard from his friend __________ last month. 1.He hasn't heard from his friend _____last month. she hasn't heard from him_______ last month. He hasn,t heard from his frend______last month.A.since B.by He hasn't heard from his friend________last month. A.since B she hasn't heard from him_______ last month.3Q He turned 73 last month but he hasn't .. he hasn't heard () his uncle for a long time He went to the beach with his friend last month. I sent emails to him last month,but he hasn't _____ to me ye My uncle went to Beijing last month.And he hasn't been back we haven't heard from them since last month.为什么这里不能用until啊?