问题

you clean the blackboard today, _________—– But I cleaned it yesterday

A:if
B:once
C:when
D:though

正确答案是：

同类题型

Who helped you clean the classroom yesterday—____________. I did it all by myself.

The problem is ________will go to themeeting

213. The PLA men ________ten miles along the road for the flood-stricken area.

If it ____ rain, we will play football tomorrow.

There’re not ______ reading rooms here.