The expo is being held in Shanghai, a lot of advanced technology is shown for the first ti

发布时间：2020-08-16 11:27:55


The expo is being held in Shanghai,     a lot of advanced technology is shown for the first time.
A. why
B. which
C. when
D. where

网友回答

A. why
B. which
C. when
(答案→)D. where
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