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New technology to make sure the cars, taxis, buses and trains we use the air. [

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New technology to make sure the cars, taxis, buses and trains we use the air. [

New technology _____ to make sure the cars, taxis, buses and trains we use _____ the air. [     ]A. is used; not to pollute
B. has used; is not polluted
C. is being used; do not pollute
D. has been used; not pollute

试题答案

C

标签：busestaxiscarswetrains

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