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A
broke
B
had broken
C
has broken
D
was breaking
正确答案 :B
解析
本题考查动词时态。
句意为“我们早上赶来工作,发现有人曾经在晚上闯进过办公室。”find后跟宾语从句,从句的动作应该发生在被发现之前,发现用了一般过去时态,故从句用过去完成时态。故选B。
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