问题
选择题
— 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
答案
答案：B
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— 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
答案：B