问题
选择题
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
答案
答案：B
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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
答案：B