The instrument ____ was not in the laboratory.A.which the professor referred usB.to which the professor referred usC.to which the professor referred to usD.which the professor referred to us
问题描述：
The instrument ____ was not in the laboratory.
A.which the professor referred us
B.to which the professor referred us
C.to which the professor referred to us
D.which the professor referred to us
答
C.意思是：教授向我们提及的那个器械不在实验室。其中professor referred to是in…ment的后置定语。第一个to表对象，to us.
答
答案选D.
refer的意思是to mention or speak about someone or something :
We agreed never to refer to the matter again. 谈及
Although she didn’t mention any names, everyone knew who she was referring to. 指
答
选D.固定用法refer sb/sth to sb/sth.此处refer the instrument to us.定语从句中用which 代替 instrument .
答
答案是选择
D不