In the days when coal was so (widely) used, (no one) realized how soon and how (

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问题 In the days when coal was so (widely) used, (no one) realized how soon and how (complete) oil would replace (it).

选项 A、widely
B、no one
C、complete
D、it

答案 C

解析应改为completely。在本句中，soon和completely用来修饰动词replace。how修饰两个副词，soon和completely并列。

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【B1】[br]【B16】A、releasedB、relievedC、realizedD、regrettedC四个选项中只有realize意为意识到