The instrument ____ was not in the laboratory.
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
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
英语人气：813 ℃时间：2019-08-18 05:17:20
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 .
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