The policeman's attention was suddenly caught by a small box which placed under the Minister's car.
A. has been
B. was being
C. had been
D. would be
网友回答
A. has been
B. was being
(答案→)C. had been
D. would be
解析:考查动词的时态。此处根据句子的意思应该用过去完成时,而且注意a small box和place是被动的关系。