Luckily only a few passengers aboard were injured in the traffic accident.A. slightlyB.

问题补充：

Luckily, only a few passengers aboard were injured in the traffic accident.

A. slightly

B. approximately

C. exactly

D. gradually

答案：

(答案→)A. slightly

B. approximately

C. exactly

D. gradually

解析：考查副词：A. slightly稍微地B. approximately大约C. exactly 确切地D. gradually逐渐地，句意：幸运的是，在车祸中只有几个车上的乘客轻微受伤。选A。