Question

【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

Answer 1

【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。