单选题
The reason why the treasure from the sunken vessel disappeared was ______.
A、
that it had been washed away by the strong currents
B、
that the sand was unceasingly shifting
C、
unknown
D、
that it had been taken by those interested parties
【正确答案】
C
【答案解析】
由题干why the treasure disappeared定位到第二段最后一句“It is a mystery why and how the treasure disappeared，unknown是原文mystery的同义转述，即人们并不清楚宝藏是如何丢失的，因而选[C]。
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