问题
选择题
____ is certain, though, is that the mystery of Tutankhamun’s tomb has never been fully explained.
A．It
B．What
C．This
D．As
答案
答案：B
考察主语从句，“可以肯定的是Tutankhamun’s tomb的迷从来没有充分解释过。”答案B。
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