单项选择题

In his culture, ______ it was, this exchange of names on pieces of paper was probably a formal politeness, like saying "thank you."

A．all that
B．whatever
C．whichever
D．what
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单项选择题
The mother separated the quarreling children, and gave each of them a sharp ______.
A．punch
B．pinch
C．puppy
D．pumpkin
单项选择题
Thousands of children nowadays prefer doing their homework to a background of pop-music ______ it in a quite room.
A．rather than doing
B．to doing
C．rather than to do
D．to do
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