A-A+
My wallet is nowhere to be found. I ______ whe
问题详情
My wallet is nowhere to be found. I ______ when I was on the bus.
A．must have dropped it
B．must drop it
C．should have dropped it
D．ought to have dropped it请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：A
解析：情态动词。“must+have+过去分词”表示对过去发生的事情的推测。
