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

发布时间：2020-08-17 12:50:28

There are several research centers in China      a certain disease called Bird Flu is being studied.
A. which
B. where
C. when
D. what

网友回答

A. which
(答案→)B. where
C. when
D. what
解析：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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