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 exp-高中英语-n多题

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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

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