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    精英家教网 > 初中英语 > 题目详情
    Our teacher told us that pollution _____ a very serious problem in the world we live.

    A. has be
    B. had been
    C. is
    D. was
    C
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    科目：初中英语 来源：期末题 题型：单选题

    Our teacher told us that pollution _____ a very serious problem in the world we live.

    [     ]

    A. has be
    B. had been
    C. is
    D. was

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