单项选择题

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

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单项选择题
With a little care he（）that accident.

A．would avoid
B．could have avoided
C．could avoid
D．must have avoided
单项选择题
Kenny speaks to me（）he were my boss.

A．even if
B．if
C．as if
D．although
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