The doctor advised Vera strongly that she should take a holiday, but didn't help.
A. it
B. she
C. which
D. he
网友回答
(答案→)A. it
B. she
C. which
D. he
解析：考查it用法。It可以指代前面提到的同一事物，或者某件事情。本题因为有连词but说明后面不是从句，而是一个并列句，故不能使用which。She和he指人。句意：医生强烈建议她去度假，但是这个建议不起作用。故A正确。