—_____we keep the window _____ all the time?
—No, you don’t have to .
| A．Can; opening | B．May; opened |
| C．Must; opening | D．Could; to open |
—_____we keep the window _____ all the time?
—No, you don’t have to .
| A．Can; opening | B．May; opened |
| C．Must; opening | D．Could; to open |
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