—There are many volunteers _____ are hel
题型：选择题
问题：
—There are many volunteers _____ are helping the children in Sichuan.
—And most of them are college students. [ ]
A. which
B. when
C. whose
D. who
—There are many volunteers _____ are helping the children in Sichuan.
—And most of them are college students. [ ]
A. which
B. when
C. whose
D. who