单选题
In the days when coal was so (widely) used, (no one) realized how soon and how (complete) oil would replace (it).
A、
widely
B、
no one
C、
complete
D、
it
【正确答案】
C
【答案解析】
[解析] 应改为completely。how修饰副词，并且soon和 completely并列。
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