I left for the office earlier than usual this morning traffic jam.A. in line withB. for

问题补充：

I left for the office earlier than usual this morning traffic jam.

A. in line with

B. for the sake of

C. in case of

D. at the risk of

答案：

A. in line with

B. for the sake of

(答案→)C. in case of

D. at the risk of

解析：几个选项的意思是：in case of“万一，以防”；for the sake of“为了…(的利益)”；at the risk of“冒险”；in line with意为“与…一致”。本句最符合逻辑的意思是：今天早晨我上班比平时早，以防堵车。因此选C.。