-- I think it’s going to be a big problem. -- Yes, it could be. I wonder ______

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问题 -- I think it’s going to be a big problem. -- Yes, it could be. I wonder ______ we can do about it.

选项 A、if
B、how
C、what
D、that

答案 C

解析根据句子结构，及物动词 do 缺少宾语，可排除 A 和 B；that在宾语从句中不充当句子成分；what 正好可作 do 的宾语。

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--Ithinkit’sgoingtobeabigproblem.--Yes,itcouldbe.Iwonder______