---May I go and play with Tom this afternoon mum?-NoYou can’t go out your homework i

问题补充：

---May I go and play with Tom this afternoon, mum?

---No．You can’t go out your homework is being done．

A. until

B. after

C. before

D. as

答案：

A. until

B. after

C. before

(答案→)D. as

解析：“妈妈，今天下午我可以和汤姆去玩吗？”“不行，你不能出去因为你正在做作业。”A．until 直到 B．after之后 C．before 之前 D．as因为，答案D。