The noise of the desks _____ could be heard in the next classroom.
| A．being opened and closed | B．opened and closed |
| C．having been opened and closed | D．to be opened and closed |
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The noise of the desks _____ could be heard in the next classroom.
| A．being opened and closed | B．opened and closed |
| C．having been opened and closed | D．to be opened and closed |
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