苹果缩果病是因缺()引起的。A、钙 B、硼 C、锌 发布时间:2019-09-01 20:36 │ 来源:www.tikuol.com 题型:单项选择题 问题: 苹果缩果病是因缺()引起的。A、钙B、硼C、锌
题型:单项选择题 The driver could have survived but he _____ the seat belt. [ ]A. had been wearingB. hadn't worn C. wasn't wearingD. didn't wear 查看答案