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Many provinces have been hit with smog. If _______ unsolved, the problem may lead to more serious results.
A．having left B．to leaveC．leftD．leaving
C

試題分析：句意：很多省份都遭遇了霧霾，如果任由問題不解決，它會導(dǎo)致更嚴(yán)重的后果。這里if條件句是省略式，完整的是If the problem is left unsolved，…，如果主從句的主語一致的話，可以省略從句的主語和be動詞，所以選C。
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