问题
单项选择题
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
答案
参考答案：A
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”。