This is the last time I shall come here to help you. 　A. that　　　B. which　　　 C. when　　　D.

问题补充：

This is the last time I shall come here to help you.

A. that

B. which

C. when

D. what

答案：

(答案→)A. that

B. which

C. when

D. what

解析：考查宾语从句，从句中不缺少成分，that起连词的作用，故选A。句意：这将是我最后一次过来帮助你。