题文
He _________ the boy's ignorance and sold him a worthless learning machine.
| A．made advantage of | B．took possession of |
| C．took charge of | D．took advantage of |
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He _________ the boy's ignorance and sold him a worthless learning machine.
| A．made advantage of | B．took possession of |
| C．took charge of | D．took advantage of |
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