题干


16. —Who____ it be that is knocking at the door?  
—It ____ be Father, but I’m not sure.  

A:can; must

B:can; may

C:must; ca

D:may; must

上一题 下一题 0.0难度 选择题 更新时间:2020-01-11 03:56:51

答案(点此获取答案解析)

B