XY GWD 11 - 28 求助

XY GWD 11 套 28

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.

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

2. they would need a visa, a landing visa, and evidence of their being inoculated against typhoid fever

3. they would need evidence of being inoculated against typhoid fever and a visa and landing card

4. they would each need a visa, a landing card, and evidence of inoculation against typhoid fever
5. they would need visas, landing cards, and evidence of inoculation against typhoid fever for each of them.

请教大家，为什么是D？

我做的时候最后不能确定是A还是D，A错在哪里？谢谢

a的话就表示所有的travelers都只用一张visa, landing card。。。

要不然要加each

可以用主动的表达就不要用被动的表达方式。