RM80清筛车采用的传动轴的伸缩量为（）。
A、110mm
B、120mm
C、130mm
D、140mm
参考答案：A
—We all had a lot of fun at the barbecue yesterday. Pity you weren’t there.
—I really should have gone with you but I _____ on some remaining problems.
A．worked
B．was working
C．would work
D．would have worked
一本书小丽每天看15页，12天就看完了，如果一天看20页，需要看几天？
—I really should have gone with you but I _____ on some remaining problems.