The serious expression of the captain kept his crew .
A. in the distance
B. from a distance
C. in a distance
D. at a distance
网友回答
A. in the distance
B. from a distance
C. in a distance
(答案→)D. at a distance
解析：考查词组：keep sb at a distance使…保持一段距离，句意：船长的严肃的表情使船员和他保持一定距离。in the distance在远处，from a distance从远处，C项是错误的词组，选D。