The authorities declared that because of the war petrol was and had to be rationed (定量供应)

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A. inadequate
B. rare
C. lacked
(答案→)D. scarce
解析：　本题译文：汽油供不应求，因此必须定量配给。D项意思：scarce(=not available in sufficient quantity, not equal to the demand)不充足的，缺乏的，供不应求的。Inadequate不适应的，不充分的。lack vt./vi. (=be without ; not have; have less than enough of) 缺乏；没有；缺少，例如：1）He lacks perseverance.(他缺乏坚定性。)2)Money is lacking for the plan.(此计划尚缺钱。)3)He is lacking in courage.(他缺乏勇气。)be lacking in 常指缺乏某种品质、特点等。lack作及物动词时，一般不用被动语态，故不能选C. lacked.4)They lacked for nothing.(他们什么也不缺。)有人认为，lack for是美国英语。