问题
选择题
“Did Jim come?” “I don’t know. He _______ while I was out.”
A．might have come
B．might come
C．mush have come
D．should have come
答案
答案：A
根据句中有关时态可知“他来”发生在过去，故排除B；根据 I don’t know 可知选项C语气太肯定，不合适；选项D的意思是“本来应该来”，与语境不合。