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(dāng)解決將會嚴(yán)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(dāng)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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