【題目】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:我們有很多事情要做。但首先我們必須睡一覺。A. at once立刻,馬上;B. at first起初;C. first of all首先;D. the first thing第一件事,通常用作主語。first of all= first 首先;at first= in the beginning最初。此處是副詞詞組用作狀語,故答案為C。

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