因为原句的问句是选择疑问句,所以用if或whether引导为什么是选择疑问句？这样不行么：paywhatby cash or credit card in this store？就是“你用现金或信用卡在这个商店付什么都没问题”？原句的问句是：Do you pay by cash or credit?和It doesn't matter. 合成的宾语从句就是：It doesn't matter whether you pay by cash or credit. 付现金或信用卡都没问题。 希望对你有启发