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

試題分析：句意：對(duì)于他們來說，爬泰山太難了。強(qiáng)調(diào)句式， It is adj for sb to do sth，做某事對(duì)某人來說怎么樣。本句中it是形式主語，指代后面不定式內(nèi)容做形式主語，this無此用法。故選D.
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