题目

It is fairly common in Africa for _______ a group of musicians surrounded by others who also join in the performances. A. there are    B. there being   C. there to be   D. there be   答案： C   考查there be句型动词不定式的复合结构形式。此处it是形式主语，介词for后应用there to be结构，故选C。  

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