She wrote a month ago, we’ve heard nothing.A. since when B. before whichC. since thatD. a

发布时间：2020-08-17 09:42:38

She wrote a month ago,      we’ve heard nothing.
A. since when
B. before which
C. since that
D. after which

网友回答

(答案→)A. since when
B. before which
C. since that
D. after which
解析：
此题答案选A，其中when 相当于 a month ago。若改为 and since then 也不可以。
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