China has invested 15.2 billion yuan so far this year to support pig keepers, in a(n) _______ to ensure enough pig supplies.
| A．contribution | B．effort | C．promise | D．purpose |
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China has invested 15.2 billion yuan so far this year to support pig keepers, in a(n) _______ to ensure enough pig supplies.
| A．contribution | B．effort | C．promise | D．purpose |
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