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问题: 初中英语单选题

Did you ask for _____ leave?
A. two days’ B. two-day C. two days D. two-day’s
选哪个,为什么?

解答:

A
如果加上“-”,这个词就变成一个形容词
即:
I want to ask for two days' leave. 或
I want to ask for a two-day leave.