Some officials still need______of the importance of separate playing fields for young football and baseball players.

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问题 Some officials still need______of the importance of separate playing fields for young football and baseball players.

选项 A、convince
B、to be convinced
C、be convincing
D、have convinced

答案B

解析 convince sb．of是“说服某人某事”的意思。由于官员是被说服的，所以应用被动语态，故应选(B) to be convinced.

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