__ is really hard __ them to climb Mount Tai. A. This, to B. It, for C. This, for D. It, to
2023-01-10 10:39:34 25次 2014-2015学年河北围场棋盘山中学九年级上期末英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
__ is really hard __ them to climb Mount Tai.
A. This, to B. It, for
C. This, for D. It, to
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