【单选题】 My wallet is nowhere to be found; ______ while I was on the bus.
A．should I dropped it
B．I must have dropped it
C．I ought to have dropped it
D．I had been dropping
网考网参考答案：B
网考网解析：
must have done表示对过去发生的事情的肯定判断。
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【单选题】 My wallet is nowhere to be found; ______ while I was on the bus.
A．should I dropped it
B．I must have dropped it
C．I ought to have dropped it
D．I had been dropping
网考网参考答案：B
网考网解析：
must have done表示对过去发生的事情的肯定判断。
查看试题解析出处>>
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