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He hasn't heard from his friend________last month. A.since B

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He hasn't heard from his friend________last month. A.since B.by the end of C.for D.until
since 和until有时好难选呀!就像上面这道题.怎样做啊?
He hasn't heard from his friend________last month. A.since B
这道题应该选A since
因为题目中用了现在完成时,而since一般是现在完成时的标志
如果题目是这样：
He didn't hear from his friend________last month.
那么这道题就应该选until
He hasn't heard from his friend________last month. A.since B He hasn,t heard from his frend______last month.A.since B.by 1.He hasn't heard from his friend _____last month. 27.He hasn’t heard from his friend __________ last month. he hasn't heard () his uncle for a long time she hasn't heard from him_______ last month. I haven’t heard from him（ ）he left home.A、when B、since C、as He's borrowed the book since two weeks ago,hasn't he?A B C D she hasn't heard from him_______ last month.3Q Has he had his dinner yet?A.Yes,he hasn't B.No,he hasn't C.Y 英语翻译he hasn't left here _____he came here A .since B.untilit He said"I haven't heard from him since May".