[讨论]一道GWD以外的语法真题，极郁闷！

At an orientation meeting, the travelers were told that a visa, a landing card, and evidence of inoculation against typhoid fever would be needed by each of them.

A.   a visa, a landing card, and evidence of inoculation against typhoid fever would be needed by each of them

D. they would each need a visa, a landing card, and evidence of inoculation against typhoid fever

其他选项肯定不对，懒得敲了，给我的答案是D。   但我觉得D有问题: they 这么多人只要一个visa吗？

新东方老白的笔记：主语（复数）+each +谓语（复数）

例句：Students each go to school.

朗文例句：My wife and I each have our own bank accounts.

我总觉得D中的a visa, a landing card, 不对。好象暗示这么多人只用一个visa.

看郎文的例句就用了accounts

而A中的be needed by each of them又好象没见过这种被动的用法。

A、D不知该选谁？

按语义，选d。可是我也不能解释这里的each，they和后面的单数之间的关系