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Reports showed that it was not the first time this state-owned firm ________ serious accidents.

[  ]

A.has happened

B.had happened

C.has experienced

D.had experienced

答案:D
解析:

解析:根据固定句型It is/was the first time that…has/had done sth.判断,排除A、C;happen为不及物动词,后不接宾语;experience(经历)为及物动词,后接宾语。故选D.


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