_____ Mom had asked Jack to close the window before he went out,______ he forgot to do it.
| A．Though; / | B．Though; but |
| C．Till; / | D．Until; then |
_____ Mom had asked Jack to close the window before he went out,______ he forgot to do it.
| A．Though; / | B．Though; but |
| C．Till; / | D．Until; then |
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