高一英语---refer to--一道选择题

The book _____ was not in the school library.
A.which the professor referred us
B.which the professor referred to us
C.to wjich the profeeor referred to us
D.to which the professor referred us
reason???????????????????

高一英语---refer to--一道选择题 请教：英语职位描述中的refer to 是什么意思 refer to 的用法 refer to的用法! refer to 和 turn to refer to与look up的区别和用法 refer to与look up的区别和用法 例句 You may refer to it for my references. 请问mention与refer to的详细区别 高一英语 The government is t____ food and clothes to flood areas.