The great changes _______ have taken place _______ carrying out the economic reform in our country.
| A．may not; unless | B．could not; without |
| C．never; but for | D．would; besides |
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The great changes _______ have taken place _______ carrying out the economic reform in our country.
| A．may not; unless | B．could not; without |
| C．never; but for | D．would; besides |
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