____ is certain, though, is that “the curse of the mummy” remains a riddle to this day.
A．AsB．WhichC．It D．What
D
考察從句連詞的選擇。根據(jù)句子結(jié)構(gòu)可知，該句為主語從句，從句中缺少is certain的主語，故選擇what。
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