Only those ____knew well could be let in...

Only those ____knew well could be let in.

A．who

B．which

C．what

D．he

A 【解析】考查定语从句。当先行词是those指人时，且关系代词在句子中做主语时，使用who.句意：只有那些很了解的人才可以被放进来。

考点分析：

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