问题
选择题
__ is really hard __ them to climb Mount Tai.
A．This, to
B．It, to
C．This, for
D．It, for
答案
答案：D
题目分析：句意：对于他们来说，爬泰山太难了。强调句式， It is adj for sb to do sth，做某事对某人来说怎么样。本句中it是形式主语，指代后面不定式内容做形式主语，this无此用法。故选D.
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