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【题目】We have a lot of things to do. But________ we must get some sleep.

A. at once B. at first C. first of all D. the first thing

【答案】C

【解析】

句意:我们有很多事情要做。但首先我们必须睡一觉。A. at once立刻,马上;B. at first起初;C. first of all首先;D. the first thing第一件事,通常用作主语。first of all= first 首先;at first= in the beginning最初。此处是副词词组用作状语,故答案为C。

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