问题

Don’t forget to close the windows when you leave the classroom.— _________

A:on, at
B:at, on
C:at, at
D:on, on;

正确答案是：

同类题型

I have booked a room ________two—I’ll check, sir

. Barry hid himself behind the door, from __________ he could hear the steps of his father clearly.

________ do you stay at home at weekends— Ten hours.

Anna, you wear a new dress today!—It fits me well, _________ the colour is not my favourite.

Nowdays,there is a ______ increase in children`s creativity ,for they are greatly encouraged to develop their talents.