问题补充：
The policemans attention was suddenly caught by a small box which placed under the Ministers car.
A. has been
B. was being
C. had been
D. would be
答案：
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。
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