I am ashamed, sir, that I wasted a lot of hours _______I should have studied at school.
| A．which |
| B．as |
| C．once |
| D．when |
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I am ashamed, sir, that I wasted a lot of hours _______I should have studied at school.
| A．which |
| B．as |
| C．once |
| D．when |
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