【题目】It is fairly common in Africa for there______ a group of expert musicians surrounded by others who also join in the performances.
A. being B. to be
C. be D. is
在线课程【答案】B
【解析】句意：在非洲，一群音乐专家被一群加入他们表演的人围住是很常见的。本题考查
there be 结构，用在It is common for sb. to do sth的结构中，故本题选B。