ThereareseveralresearchcentersinChina

問題詳情：

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

A. which        B. where            C. when                   D. what

【回答】

B. 因為先行詞是research centers並在定語從句中作狀語，所以用where。

知識點：定語從句

題型：選擇題