— I'm sure our surroundings will become better. — It is still a problem _____ we can control the pollution. [ ]A. thatB. whetherC. if D. why -高中英语-魔方格

◎ 题干

— I'm sure our surroundings will become better.
— It is still a problem _____ we can control the pollution.

[ ]

A. that
B. whether
C. if
D. why

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◎ 解析

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◎ 知识点

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