问题

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

正确答案是：

同类题型

Is John doing his homework now? — He should, but he _______ not. He likes playing computer games.

re teenagers watch actors smoking infilms, the more ______ they are to take up the habit of smoking themselves

Do you know when Mr. White will come back—- Perhaps next week, but ___________ .

re week, ______ we will notaccomplish the task

Don’t / weist / your time doing that thing.