题目内容
There are several research centers in China ________ a certain disease called Bird Flu is being studied.
A. which B. where C. when D. what
B
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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题目内容
There are several research centers in China ________ a certain disease called Bird Flu is being studied.
A. which B. where C. when D. what
B
因为先行词是research centers并在定语从句中作状语,所以用where。