______ takes a lot of concentration and a great sense of balance to stay on it.A
题型：不详难度：来源：
| ______ takes a lot of concentration and a great sense of balance to stay on it. |
答案
| A |
解析
试题分析：句意：这需要高度的专注和很好的平衡感才能站在上面。这里使用it做形式主语，句型是:It takes sth to do …..，it是形式主语，不定式是真正的主语，所以选A。 |
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