单项选择题

Working parents usually don't have enough time ______ with their children.

A．stay
B．stayed
C．to stay
D．staying
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单项选择题
It never occurred to her until she was dying ______ her big property would be the source of hostility among her children.
A．how
B．where
C．when
D．that
单项选择题
The father can't be deep in his work as his son ______ him with silly questions.
A．is interrupting
B．interrupts
C．is being interrupting
D．has interrupted
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