问题
选择题
_____ we were worried about was _____ they could manage to control the pollution. [ ]
A. That; how
B. What; whether
C. That; whether
D. What, that.
答案
答案：B
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_____ we were worried about was _____ they could manage to control the pollution. [ ]
A. That; how
B. What; whether
C. That; whether
D. What, that.
答案：B