摘要：7．New technology to make sure that the cars, taxis, buses and trains we use the air. A．is used; not pollute B．has used; is not polluted 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>>