completelynecessary;extremelyimportantinaparticularsituationorforaparticularactivity;vital
A. satisfactory
B. essential
C. congenial
D. attainments
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Shehas________agoodknowledgeofEnglish.她英语已经学得很好。
Ayoungwomanofimpressiveeducational_________.一位学业成就斐然的年轻女子
Thespeakerwasnot______bythejeersofthecrowd.演说者并没有因为听众喝倒彩而心慌意乱。