1. "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
【陷阱】容易误选B，误认为这是考查not...until...结构。
【分析】最佳答案选 C。句中的 your work is being done 表明"你正在做作业"，选 as 表原因。
2. "I'm going to the post office." "_______ you're there, can you get me some stamps?"
A. As B. While C. Because D. If
【陷阱】容易误选A。
