There are several research centers in China ________ a certain disease called Bird Flu is being stud

题目简介

There are several research centers in China ________ a certain disease called Bird Flu is being stud

题目详情

There are several research centers in China ________ a certain disease called Bird Flu is being studied.
A.whichB.whereC.whenD.what
题型:单选题难度:偏易来源:不详

答案

B
因为先行词是research centers并在定语从句中作状语,所以用where。

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