He be sitting at the gate, waiting for his lost son.A. used toB. was used toC. couldD. wa

He be sitting at the gate, waiting for his lost son.
A. used to
B. was used to
C. could
D. was accustomed

(答案→)A. used toB. was used toC. couldD. was accustomed解析：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。

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