Question

_______ Mary ______ John has been to China before, but they know a lot about it

A．Either, or

B．Both, and

C．Neither, nor

D．Not only, but also

Answer 1

C

从下文but转折可知他们懂得许多关于中国的事，可知他们都没有去过中国。neither···nor表示既不···也不，故选Ｃ。Either…or表示要么…要么；both…and 表示两者都；not only…but also表示不但…而且。