A:after
B:it
C:because
D:until
如图所示的正方形和长方形卡片若干张,拼成一个长为(a+3b),宽为(2a+b)的矩形,需要这三类卡片共____ 张.
— In general, what our teacher says is good for us.
—I can ' t agree more.
The teacher doesn't allow us the dictionary in the test.