题目

阅读下面文言文,完成下面小题。 吕大防,字微仲,其先汲郡人。大防进士及第,调永寿令。县无井,远汲于涧,大防行近境,得二泉,欲导而入县,地势高下,众疑无成理。大防用《考工》水地置泉之法以准之,不旬日,果疏为渠,民赖之,号曰“吕公泉”。迁著作佐郎、知青城县。故时,圭田【注】粟入以大斗而出以公斗,获利三倍,民虽病不敢诉。大防始均出纳以平其直,事转闻,诏立法禁。青城外控汶川,与敌相接。大防据要置逻,密为之(2012·全国卷Ⅰ)I ________ use a clock to wake me up because at six o'clock each morning the train comes by my house.A.couldn'tB.mustn'tC.shouldn'tD.needn't
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