组卷网 > 高中英语综合库 > 语法 > 词法 > 非谓语动词 > 动词不定式 > 不定式的时态和语态 > 不定式的一般式:to+动词原形
题型:单项选择 难度:0.65 引用次数:25 题号:19286188
When Mark Twain was young he did his best _______.
A.to earn his leavingB.earn his leaving
C.to earn his livingD.earning his living

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