The boy is standing at the school gate is our monitor.A. whichB. whoseC. whoD. when

问题补充：

The boy is standing at the school gate is our monitor.

A. which

B. whose

C. who

D. when

答案：

A. which

B. whose

(答案→)C. who

D. when

解析：考察定语从句。本题定语从句的先行词是the boy，这是一个指人的名词，定语从句中缺少主语，故使用关系代词who指代先行词在句中作主语。AD的先行词不能是人，whose在句中不能做主语，只能做定语。句意：那个站在校门口的男孩是我们的班长。故C正确。