Question

【题目】They waited and waited, and_____ he came back.

A. at once B. at first

C. at the end D. at last

Answer 1

【答案】D

【解析】

试题分析：句意：他们等啊等，最后他回来了。at once立刻；at first起初；at the end通常后边要跟上其它成分,即完整的形式是: at the end of sth,意思是"在...的末尾,在...结束的时候"。at last最后。根据句意，选D。