需要准备什么资料用英语怎么说

materials should be prepared
需要准备的资料

what kind of materials should be prepared
需要准备什么资料

建议在句末加in advance,强调是事前准备

What kind of materials should be (可以加上主语亦可不加）prepared ?

What kind of material should be prepared？

what kinds of informations(materials) need to (be prepared) prepare?

What information shuld be prepared?

关于你要求提供的测试报告，不知道工厂为什么没有回答?