We do jobsthey need to be done and that could be early in the morning or late at night. A.

问题补充：

We do jobsthey need to be done and that could be early in the morning or late at night.

A. that

B. which

C. when

D. how

答案：

A. that

B. which

(答案→)C. when

D. how

解析：考查状语从句。本题考查when引导的时间状语从句。句意：这些工作是必须要做的工作我们可以在大清早或者在深夜去完成。