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……
Robots____things that people can't,such as traveling to Mars.
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,
A.used to doing
B.used to do
C.are used to do
D.are used to doing
请说明原因,
英语人气：704 ℃时间：2020-04-01 11:29:22
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