—Robert is indeed a wise man.
—Oh, yes. How I regretted __________ his advice!
| A．to take | B．to have not taken |
| C．taking | D．not having taken |
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—Robert is indeed a wise man.
—Oh, yes. How I regretted __________ his advice!
| A．to take | B．to have not taken |
| C．taking | D．not having taken |
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