It is fairly common in Africa fora group of musicians surrounded by others who also join i

网友回答

A. there are
B. there being
(答案→)C. there to be
D. there be
解析：
这题考查不定式做主语的用法，句型是：It’s +adj.+for sb to do。这里用的是there be句型，所以选there to be。句意是：在非洲有一群音乐家被别人包围着，这群人也同样参加了表演这是相当普遍的。