-- 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 |
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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 |
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