After chatting online for along time, Mary looked up, ＿＿that it was 11：00 pm, long past her usual bedtime.
| A．to see | B．saw | C．seeing | D．seen |
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After chatting online for along time, Mary looked up, ＿＿that it was 11：00 pm, long past her usual bedtime.
| A．to see | B．saw | C．seeing | D．seen |
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