问题描述：
求英语题答案详解!关于谓语的单复数!
Half an hour ____ ______ (pass) since the train __________ (leave).
答案 是has passed left 还是 have passed left?
Half an hour ____ ______ (pass) since the train __________ (leave).
答案 是has passed left 还是 have passed left?
问题解答：
我来补答展开全文阅读