单项选择题

He didn't realize the value of friendship（）he had lost it.

A．if
B．as
C．while
D．until

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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
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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