问题

Nothing can be done _______ he returns.

A: as
B: before
C:while
D: until

正确答案是：

同类题型

.It was_________Asimov was eleven yearsold________ his talent for writing became obvious.

下列各项中，没有语病的一项是（）

You must return my book to me . You _______ it for two weeks.

Then ____ that the war was over.

Do you need any help,Lucy? -Yes.The job is I could do myself[ ]