---There are many volunteers ______ are helping the children in Sichuan.
--- And most of them are college students.

---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.

1. A.
   which
2. B.
   when
3. C.
   whose
4. D.
   who