if you want to borrow a tennis racket after school ,your student card ------here.
问题描述：
if you want to borrow a tennis racket after school ,your student card ------here.
A.has to leave B.must leave C.has to be left D.need to leave
答案是c,请讲一下这4种答案的区别?
答
答案：C
翻译：如果放学后你想借一副网球拍,你的学生证必须放在这里.
作主语的是学生证,所以这里用被动语态,其结构是：be + 过去分词,由此排除ABD.