It must have been they who gave the signal.为什么是they而不是them呢?
It must have been they who gave the signal.为什么是they而不是them呢?
英语人气：672 ℃时间：2019-11-04 19:16:38
优质解答
因为后面有个定语从句who gave the signal.只能用they ,而them后不能跟定语从句
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