— a volunteer is great.—I think so. Some of us wantvolunteers for the London Olympics.A.

问题补充：

— a volunteer is great.

—I think so. Some of us wantvolunteers for the London Olympics.

A. Being; being

B. To be; being

C. Being; to be

D. To be; to be

答案：

A. Being; being

B. To be; being

(答案→)C. Being; to be

D. To be; to be

解析：句意：作为一个志愿者太伟大了。——我也这么认为。我们中的一些人想成为伦敦奥运会的志愿者。动名词做主语表示抽象动作，不定式做宾语表示具体的将要进行的动作，结合语境可知选C。