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    18、Some English scientists are identifying problems ____ technology in the 21st century. If solved, the solutions could change the world.

    A．facing                         B．faced                  C．being faced          D．having faced

    18、A

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    Some English scientists are identifying problems ____ technology in the 21st century. If solved, the solutions could change the world.


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    科目：高中英语 来源： 题型：

    Some English scientists are identifying problems ____ technology in the 21st century. If solved, the solutions could change the world.

    A．facing                         B．faced                  C．being faced          D．having faced

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