“May I go and play with Dick this afternoon Mum?” “No you can’t go out your work is bei

问题补充：

“May I go and play with Dick this afternoon, Mum?” “No, you can’t go out your work is being done.”

A. before

B. until

C. as

D. the moment

答案：

A. before

B. until

(答案→)C. as

D. the moment

解析：句中的 your work is being done 表明“你正在做作业”，选 as 表原因。