选择:Don't leave the office until your friend___back.A.cameB.comesC.have comeD.will come

问题描述:

选择:Don't leave the office until your friend___back.A.cameB.comesC.have comeD.will come

答案应该为B
此处前半句是否定祈使句,后半句的until 与前面构成“not...until"的句型,意为“直到……才……”
后面until 引导的其实是条件关系句,应该用一般现在时comes来表示将来的状态.