Mr. Johnson starts to work very early in the morning and goes on working until late in the

问题补充：

Mr. Johnson starts to work very early in the morning and goes on working until late in the afternoon a break at midday.

A. with

B. for

C. as

D. through

答案：

(答案→)A. with

B. for

C. as

D. through

解析：with a break at midday为with的复合结构在句中作状语。