问题
选择题
Amy ____the windows already, so the room looks much bright. [ ]
A. cleans
B. has cleaned
C. is cleaning
D. will clean
答案
答案：B
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Amy ____the windows already, so the room looks much bright. [ ]
A. cleans
B. has cleaned
C. is cleaning
D. will clean
答案：B
交换积分次序后等于（）。