These young people have much to be dissatisfied with, and they sometimes do ______, but on the whole they study hard, knowing th

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问题 These young people have much to be dissatisfied with, and they sometimes do ______, but on the whole they study hard, knowing the problems the state is facing.

选项 A、grumble
B、frustrate
C、frown
D、perplex

答案A

解析 grumble"抱怨",与complain同义;frustrate"挫败,使感到灰心",如果用被动语态be frustrated还讲得通;frown"皱眉";perplex"迷惑不解"。
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