问题
The new buyer identified a dozen new sources for the material, ___________ proved to be reliable．
A:most of them
B:most of which
C:most of whom
D:most of those
B:most of which
C:most of whom
D:most of those
正确答案是：
同类题型
Jimson found the map of great valuewhen ______ Beijing.
I early in the morning when I was still a child.
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When did your uncle arrive in China— He got to Guangzhou themorning of the 16th of April.