The voyages of travellers before the 17th century show that they were not _____ the sea even though

题目简介

The voyages of travellers before the 17th century show that they were not _____ the sea even though

题目详情

The voyages of travellers before the 17th century show that they were not _____ the sea even
though they didn't have modern navigational aids.
                                                                                                                                    [     ]
A. at the expense of
B. at the risk of
C. in the way of
D. at the mercy of
题型:单选题难度:偏易来源:专项题

答案

D

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