The doctor advised Lisa strongly that she should take a holiday but didn’t help.A. itB. w

问题补充：

The doctor advised Lisa strongly that she should take a holiday but didn’t help.

A. it

B. which

C. what

D. this

答案：

(答案→)A. it

B. which

C. what

D. this

解析：本题考查代词的用法。本题中but连接两个并列句，it指代医生向Vera提建议这件事。其它选项无此用法。故选A。