If       unsolved, the problem of food safety may lead to more serious results.
A．having leftB．to leaveC．leftD．leaving
C

試題分析：句意：如果食品安全問題被任由不解決，就會導致更嚴重的后果。這是一個狀語從句的省略句，完整的句子是：If the problem of food safety is left unsolved，當主從句的主語一致的時候，可以省略從句的主語和be動詞，選C。
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