问题
选择题
Two middle-aged passengers fell into the sea. _______, neither of them could swim.
A．In fact
B．Luckily
C．Unfortunately
D．Naturally
答案
答案：C
根据题意"两名中年乘客落入水中，两人都不会游泳"可知此处应为Unfortunately "不幸的是"。答案：C
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