单选题 Born ten days earlier, the boy ______ his late father.

A. could have seen
B. must have seen
C. may have seen
D. should have been

【正确答案】 A

【答案解析】[解析] could have seen表示客观存在的可能。这是一个虚拟语气句子，意为“如果再早出生10天的话，他就能见到他父亲。”must have seen“一定能见”，表示对过去事情的肯定推测；may have seen“也许会见”；should have seen“本应该见”。