Where is Jack?He's gone either to Hainan or Shanghai,I'm not sure----A whichB where选哪个为什么
问题描述：
Where is Jack?He's gone either to Hainan or Shanghai,I'm not sure----
A which
B where
选哪个
为什么
答
b
which代词，指代前面hainan shanghai
答
B
完整的是I'm not sure where he has gone.
应该是I'm not sure which to ...
答
选B 这个是一个定语从句 看后面I AM NOT SURE 什么 .什么做的是那里 什么 怎么这样的词.结合语境 是去了那里 而且是2选1 故用WHICH代替来了提问