問題補(bǔ)充：
單選題
Food safety issues, ____ will seriously affect the growth of teenagers and even the nation’s future.A.if not solved properlyB.not if solved properlyC.if solved properlyD.not if properly solved
網(wǎng)友答案：
熱心網(wǎng)友 1樓
A解析考查非謂語(yǔ)動(dòng)詞。根據(jù)句意，此處應(yīng)為否定，排除C. 非謂語(yǔ)動(dòng)詞的否定詞not應(yīng)放在非謂語(yǔ)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, ….。
