题文
Canada is one of the countries that __________ a free education system __________ by the government.
| A．have ； to pay |
| B．has ； pay for |
| C．have ； paid for |
| D．has ； paid |
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Canada is one of the countries that __________ a free education system __________ by the government.
| A．have ； to pay |
| B．has ； pay for |
| C．have ； paid for |
| D．has ； paid |
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