______ takes a lot of concentration and a great sense of balance to stay on it.

A. It B. This C. What D. That

 

A

【解析】

試題分析：句意：這需要高度的專注和很好的平衡感才能站在上面。這里使用it做形式主語，句型是:It takes sth to do …..，it是形式主語，不定式是真正的主語，所以選A。

考點：考查it做形式主語

 

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