专四
A．which
B．that
C．who
D．whom
【解析】关系代词that在从句中作主语补语。这里需要一个连词既连接定语从句又作从句中的主语补语．只有B符合要求。who引导定语从句时作主语，而whom则作从句中的宾语，因此C和D都不可选．which不引导修饰人的定语从句，因此在这里也不合适。
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A．may
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