【题目】— Why are your hands that dirty?
— Oh, I______ in the garden since we finished breakfast.
A. worked B. was working
C. am working D. have been working
在线课程【答案】D
【解析】
试题分析：考查动词时态。句意：你的手为什么这么脏？哦，我们吃完早餐我就在花园里忙碌了。这个时间是从过去到说话之前一直在干某件事，是延续性的，用现在完成进行时，故选D项。