Robots__things that people can't,such as traveling to MarsA.used to doingB.used to doC.are used to doD.are used to doing

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Robots__things that people can't,such as traveling to MarsA.used to doingB.used to doC.are used to doD.are used to doing
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Robots__things that people can't,such as traveling to MarsA.used to doingB.used to doC.are used to doD.are used to doing
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

Robots__things that people can't,such as traveling to MarsA.used to doingB.used to doC.are used to doD.are used to doing
选C 机器人被用于做一些人类所不能做的事情,比如说到火星上去.

do

can do