Robots____things that people can't,such as traveling to Mars.
A.used to doing
B.used to do
C.are used to do
D.are used to doing
请说明原因,
人气：377 ℃ 时间：2020-04-01 11:29:22
解答
C
句意是：机器人被用来做人类不能做的事,比如到火星旅行.
be used to do sth 被用来做...,可替换为be used for sth/doing sth
used to doing无此句式
used to do过去常常做……
be used to doing习惯做……
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