______ is often more difficult to find trained men than to get financial support

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问题 ______ is often more difficult to find trained men than to get financial support for scientific research.

选项 A、It
B、That
C、This
D、What

答案 A

解析本题考查固定句型的用法。“It is...(for sb.)to do...”是固定句型，它的意思是“(某人)做……怎么样”。其中it是形式主语，真正的主语是句子中的不定式结构，因此本题的正确答案是选项A。

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