________ is very difficult ________ such a high mountain.

A. This；to climb B. It；to climb C. This；climbing D. It；climbing

B 【解析】 句意：爬那么高的一座山是非常困難的。在英語中為了避免主語過長，可以用it代替動詞不定式作形式主語，其結構為：it is（was）+形容詞（名詞）+動詞不定式。故選B。
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