Great efforts to increase grain production       if food shortages are to be avoided.
A．could be madeB．must be made
C．might be madeD．would be made
B
考查情態(tài)動(dòng)詞的用法。句意“如果要避免食物短缺，就必須盡最大努力來提高谷物產(chǎn)量。”make great efforts to do sth.“盡很大努力做某事”；could和might意為“可以”，語氣不強(qiáng)，must表示“必須”。故選B。
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