问题描述：
一道英语选择题(说清楚原因） We'll go on a _________visit to Mount Tai.
We'll go on a _________visit to Mount Tai.
A.two days
B.two-day
C.two day's
We'll go on a _________visit to Mount Tai.
A.two days
B.two-day
C.two day's
问题解答：
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