1.我觉得应该选C,因为没有用完成时的标志.
2.选A,试试翻译一下吧,我这些天正在为···做准备,如果用D的话应该要有完成时的标志的,since```
3.B
4.D选项raining都打错了.我也没看过这种结构
5.D
6.C
英语单项答案及解析.1.The windows are so clean .Who_________it?A.clean
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