C
句意是：機器人被用來做人類不能做的事,比如到火星旅行.
be used to do sth 被用來做...,可替換為be used for sth/doing sth
used to doing無此句式
used to do過去常常做……
be used to doing習慣做……
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
請說明原因,
A.used to doing
B.used to do
C.are used to do
D.are used to doing
請說明原因,
英語人氣：632 ℃時間：2020-04-01 11:29:22
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