You ought to know better than ____ yourself in unnecessary expense.
You ought to know better than ____ yourself in unnecessary expense.
A、to involve
B、involve
C、involving
D、involved
【正确答案】：A
【题目解析】：这是一个比较级,than只是比较级的象征；比较的两者是并列关系,形式上一致，都是不定式
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