Sooner or later the old palace will get ruined if . A. being left unrepaired B. not left

问题补充：

Sooner or later, the old palace will get ruined if .

A. being left unrepaired

B. not left repaired

C. left unrepaired

D. having left unrepaired

答案：

A. being left unrepaired

B. not left repaired

(答案→)C. left unrepaired

D. having left unrepaired

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