问题

_____ I admit that all these problems are difficult, I don’t agree that they cannot be solved

A:Unless
B:While
C:Until
D:Since

正确答案是：

同类题型

4．My hands are dirtyI ______ the wall the whole morning but haven’t finished yet

We always lose sight of those who adore(爱慕) us, adore those who ___________ us, and hurt those who love us.

You look so happy!—Jack says I am pretty.________ has evertold me that before.

The PLA man made a dive ___ the smoking box

You’d better not the girl with a personal question.[ ]