_Where is Jack _He's away to spend his holiday.He's gone either to Hangzhou or to Wuhan,but

问题描述:

_Where is Jack _He's away to spend his holiday.He's gone either to Hangzhou or to Wuhan,but
I'm not sure___.
A where B which C that D therre
选哪个,为什么,

which 因为是两个之中选一个.如果没有后面的句子,直接说Where is Jack _He's away to spend his holiday.I'm not sure where