_____we promise continuous increase in rural incomes _____improve the whole people's well-being．
| A．Only if; we can | B．If only; can we | C．Only if; can we | D．Unless; we can |
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_____we promise continuous increase in rural incomes _____improve the whole people's well-being．
| A．Only if; we can | B．If only; can we | C．Only if; can we | D．Unless; we can |
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