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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．not if properly solved
D．if not solved properly
D
句意：這些問題如果不被恰當解決將會嚴重影響青少年的成長甚至國家的未來。if not solved properly是if they are not solved properly的省略形式。當主、從句的主語一致，且從句中謂語為be時，可省略從句中的主語和動詞be。
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