Food safety issues, will seriously affect the growth of teenagers and even the nation’s future.
A. if not solved properly
B. not if solved properly
C. if solved properly
D. not if properly solved
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(答案→)A. if not solved properly
B. not if solved properly
C. if solved properly
D. not if properly solved
解析：考查非谓语动词。根据句意，此处应为否定，排除C. 非谓语动词的否定词not应放在非谓语动词的前面，故排除B和D. 故A项正确。等于if they are not solved properly, ….。