问题
选择题
___ is really hard ___ them to climb Mount Tai.[ ]
A. This, to
B. It, for
C. This, for
D. It, to
答案
答案：B
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___ is really hard ___ them to climb Mount Tai.[ ]
A. This, to
B. It, for
C. This, for
D. It, to
答案：B