题文
________back at my middle school years，I regret not having worked so hard as I should have.
| A．Looking |
| B．To look |
| C．Looked |
| D．Look |
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________back at my middle school years，I regret not having worked so hard as I should have.
| A．Looking |
| B．To look |
| C．Looked |
| D．Look |
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