____ is certain, though, is that “the c...

____ is certain, though, is that “the curse of the mummy” remains a riddle to this day.

A．As

B．Which

C．It

D．What

D 【解析】考察从句连词的选择。根据句子结构可知，该句为主语从句，从句中缺少is certain的主语，故选择what。

考点分析：

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