问题
单项选择题
Greater efforts to increase agricultural production must______if food shortage is to be avoided．
A．be made
B．make
C．have made
D．have been made
答案
参考答案：A
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Greater efforts to increase agricultural production must______if food shortage is to be avoided．
A．be made
B．make
C．have made
D．have been made
参考答案：A