我也要来请教个问题
The Smiths are teaching in Shanghai.   _____  of  them  are from America.
答案是 Both。为什么不是 All  呢？ 又没说明只有两个人。.

请教Neither he nor she _____ interest in the film.
A.are B.have C.is D.has
答案为何是D?C不行吗？

It is possible to ___ six hours on a plane and arrive at the same hour that you left.
A.make B.cost C.take D.spend
答案是D,我怎么感觉C也没错呀？.

谢谢，明白了.