单项选择题

At that moment when he was told that the radio station had found his son for him, it was all he could do ______.

A．cry
B．crying
C．to cry
D．cried
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单项选择题
My father always hopes that I could ______ with his friends’ children but I prefer to stay alone.
A．blend
B．mingle
C．merge
D．combine
单项选择题
Three hours has passed since the discussion was begun, and I'm afraid they will ______ it still longer.
A．expand
B．stretch
C．protract
D．extend
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