单项选择题

______ in thought, he didn't take notice of me when I was passing by.

A．Lose
B．Lost
C．Having lost
D．Have lost
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单项选择题
First aid can save a person's life if ______ immediately and properly.
A．perform
B．performing
C．performed
D．to perform
单项选择题
The old man, ______ abroad for twenty years, is on the way back to his motherland.
A．to work
B．working
C．to have worked
D．having worked
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