The policeman's attention was suddenly caught by a small box which ______ placed under the Minister's car.
A．has beenB．was beingC．had beenD．would be
C
考查動詞的時態(tài)。此處根據(jù)句子的意思應該用過去完成時，而且注意a small box和place是被動的關系。
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