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
If I had time this evening, I ______ to your birthday party.
A．went
B．will go
C．would go
D．had gone
单项选择题
______ the program, they have to stay there for another two weeks.
A．Not completing
B．Not completed
C．Not having completed
D．Having not completed
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