After her son’s death, the old lady sit at the window, deep in thought.A. wouldB. should

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(答案→)A. would
B. should
C. could
D. might
解析：考查情态动词。would 会，常常做某事，should 应该，could 可以，might 可能，句意：她的儿子去世之后，这位老妇人常常会坐在窗户旁边，陷入沉思。故选A。