Two middle-aged passengers fell into the lake．________, neither of them could swim．

Two middle-aged passengers fell into the lake．________, neither of them could swim．

A.In fact

B.Luckily

C.Unfortunately

D.Naturally

答案及解析： C

解析：

两个都不会游泳的乘客掉进湖里去了，这自然是一件不幸的事。