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Theinstrument____wasnotinthelaboratory.A.whichtheprofessorreferredusB.towhichtheprofessorreferredusC.towhichtheprofessorreferredtousD.whichtheprofessorreferredtous
题目内容：
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优质解答
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 .
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
优质解答
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