If ____ unsolved, the problem of food safety may lead to more serious results.
A．makingB．remainedC．leftD．taking
C
考查省略句。the problem與leave構成被動關系，使用過去分詞。完整的結構應該是If the problem is left unsolved, the problem of food safety may lead to more serious results.句意：如果這個問題被留在沒有被解決，它會導致更嚴重的后果。
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