题文
When I _________ the past and think how much time has been wasted, my heart bleeds.
| A．look back at | B．look forward to |
| C．look out of | D．look away from |
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When I _________ the past and think how much time has been wasted, my heart bleeds.
| A．look back at | B．look forward to |
| C．look out of | D．look away from |
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