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。
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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