Some English scientists are identifying problems ____ technology in the 21st century. If solved, the solutions could change the world.A．facingB．facedC．being fa-高中英语-n多题

◎ 题干

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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◎ 解析

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◎ 知识点

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