单项选择题

He didn't look well, for he（）for sixteen hours.

A．had worked
B．would have worked
C．was working
D．had been working

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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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