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题目内容
（国家开放大学英语语法）
If they _____ the hole in the sidewalk, this accident_____.
A.fix; will be avoided
B.fix; was avoided
C.had fixed; could have been avoided
D.have fixed; has been avoided
A.fix; will be avoided
B.fix; was avoided
C.had fixed; could have been avoided
D.have fixed; has been avoided
参考答案