---So you've left the classroom key inside again?
---No.I've got it with me this time,but I have forgotten ______ the door?
| A．locking | B．locked | C．to lock | D．to have locked |
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---So you've left the classroom key inside again?
---No.I've got it with me this time,but I have forgotten ______ the door?
| A．locking | B．locked | C．to lock | D．to have locked |
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