问题

How can they learn anything useful ______ they spend all their spare time playing online games?

A:while
B:unless
C:although
D:when

正确答案是：

同类题型

The little girl _____her seat to an old man on the bus.–What a kind girl!

Everything is right here, ?

The shop will be closed for repairs ________ further notice.

下列各句没有语病的一项是

We should try our best to realize our ______.—Yes, I think so, wish you good luck!