问题补充:
7、Every possible means to prevent the air pollution, but the sky is still not clear.
A. is used
B. are used
C. has been used
D. have been used
答案:
A. is used
B. are used
(答案→)C. has been used
D. have been used
解析:可联系答案网客服索取此答案。
时间:2023-06-06 13:04:37
7、Every possible means to prevent the air pollution, but the sky is still not clear.
A. is used
B. are used
C. has been used
D. have been used
A. is used
B. are used
(答案→)C. has been used
D. have been used
解析:可联系答案网客服索取此答案。
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