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The instrument ____ was not in the laboratory.

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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
The instrument ____ was not in the laboratory.
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 .
Dr Jones ordered ____ for the laboratory. they should test the types of oil in the laboratory,____? in the laboratory of art,the artistand his mode ____ of plastics,the instrument is light.(make） There was not a cloud in the sky.(改为同义句）There ____ _____clou The instrument was bought by my grandfather many years ago. The instrument was bought by my grandfather many years ____,the man would not give in In the beginning,there was not much_____, 英语翻译EXPERIMENTALReagentsODOPB was prepared in our laboratory Mike was the ____(十二)in the final exam. She was ____ the top prize in the competition.