卫生类
单选题
Those countries were once worried that they would not have adequate supplies of petroleum.
Those countries were once worried that they would not have adequate supplies of petroleum.
A．effective
B．efficient
C．potential
D．sufficient
参考答案：D进入在线模考
本题是对形容词的考查。题干：那些国家一度担心他们没有足够的汽油供给。题干划线词adequate意为“足够的”。effective意为“有效的”，efficient意为“有效率的”，
potential意为“潜在的”，sufficient意为“足够的，充足的”，所以正确答案为D。
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