He ______ be sitting at the gate, waiting for his lost son.A.used toB.was used toC.couldD.was accustomed
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A解析试题分析：句意：他过去常常坐在门口，等候他的失踪的儿子。used to do过去常常；was used to doing习惯于；was used to do被用来；could能够；be accustomed to doing 习惯于。根据句意故选A。考点：考查动词短语辨析。
点评：本题难度适中。动词短语辨析是近几年高考常考的内容，需要考生平时加强背诵短语的意义及用法，命题者还考查学生对语境的理解。这里主要考查“习惯于”的几个短语的表达方式，考生容易误选B。即学即练: The helicopter ______ transport the wounded.A. used to B. was used to C. could D. was accustomed解析：B。句意：这架直升飞机被用来运送伤员。