takes a lot of concentration and a great sense of balance to stay on it.A. ItB. ThisC. Wh

发布时间：2020-08-17 10:58:47

     takes a lot of concentration and a great sense of balance to stay on it.
A. It
B. This
C. What
D. That

网友回答

(答案→)A. It
B. This
C. What
D. That
解析：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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