27.No decision ___________ about the trip until the headmaster has come back.A.is made B.will b

分类: 作业答案 • 2022-05-29 11:01:02

问题描述：

27.No decision ___________ about the trip until the headmaster has come back.A.is made B.will b
为什么从句用现在完成时时主句也是用一般将来时呢

答

班主任回来还没有发生,决定也没有下,所以主句是将来时,用完成时是因为decision 是要在班主任已经回来后才be made .