These problems, ________, will seriously affect the growth of teenagers and even the nation’s future.
A．not if solved properlyB．if solved properly
C．if not solved properlyD．not if properly solved
C

試題分析：句意：這些問題如果不能解決，就會嚴(yán)重影響少年的成長甚至說是國家的未來。這里是條件狀語從句的省略，完整的是：if these problems are not solved properly,…，當(dāng)主從句的主語一致的時(shí)候，可以省略從句的主語和be動詞，所以選C。
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