单项选择题

If he had followed the doctor's instruction and（）in bed to rest, he（）recovered already.

A．had laid; would
B．had been lain; would
C．had lain; would have
D．was laid; would have been

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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
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
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