It is fairly common in Africa for _____ a group of musicians surrounded by others who also join in the performance.

A．there are

B．there being

C．there to be

D．there be

在我国香港特别行政区和英国，证券投资基金一般被称为（）．

A.共同基金

B.单位信托基金

C.证券投资信托基金

D.私募基金