题目内容

__ is really hard __ them to climb Mount Tai.
A．This, toB．It, toC．This, forD．It, for
D

试题分析：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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