问题

The children ____ very quiet;I wonder what they ____ up to
A:when
B:that
C:since
D:before
B:that
C:since
D:before
正确答案是:
同类题型
Though they lost the game, a small but_____crowd cheered as the players came off the court.
e arrived, she went straight to ___ kitchen andstarted to prepare ___ meal for us.
I don’t know if Mike _______to my school tomorrow. If he____, I will be very happy.
The boy ___________ and then he __________ after he took the medicine.