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
A
考查非謂語動(dòng)詞。根據(jù)句意，此處應(yīng)為否定，排除C. 非謂語動(dòng)詞的否定詞not應(yīng)放在非謂語動(dòng)詞的前面，故排除B和D. 故A項(xiàng)正確。等于if they are not solved properly,  ….。
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