摘要： New technology to make sure that the cars, taxis, buses and trains we use the air. A. is used, not to pollute B. has used, is not allowed C. is being used, do not pollute D. has been used, to pollute
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New technology ______ to make sure that 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; to pollute
New technology ______ to make sure that 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; to pollute
查看习题详情和答案>>. New technology ______ to make sure that 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; to pollute
查看习题详情和答案>>