If they _____ the hole in the sidewalk, this accident_____.<br />A.fix; will be avoided<br>B.fix; was avoided<br>C.had fixed; could have been avoided<br>D.have fixed; has been avoided

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

出自：国家开放大学英语语法

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