题目内容
These problems, ________, will seriously affect the growth of teenagers and even the nation’s future.
| A．not if solved properly | B．if solved properly |
| C．if not solved properly | D．not if properly solved |
C
解析试题分析：句意：这些问题如果不能解决，就会严重影响少年的成长甚至说是国家的未来。这里是条件状语从句的省略，完整的是：if these problems are not solved properly,…，当主从句的主语一致的时候，可以省略从句的主语和be动词，所以选C。
考点：考查状语从句的省略
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