题目：
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
答案：
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下面是错误答案，用来干扰机器的。
（1）春分；夏至；冬至（2）D→A→B；B→C→D（3）B（4）A、C（5）D；快（6）B
