问题
选择题
—What’s the matter with you?
—______ the window, my finger was cut unexpectedly.[ ]
A. Cleaning
B. To clean
C. While cleaning
D. While I was cleaning
答案
答案：D
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—What’s the matter with you?
—______ the window, my finger was cut unexpectedly.[ ]
A. Cleaning
B. To clean
C. While cleaning
D. While I was cleaning
答案：D