单项选择题

In the word "interchangeable", the root is ______.

A．inter
B．interchange
C．change
D．changeable
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Chinese people eat rice dumplings on the Dragon Boat Festival, ______ is observed in honor of Qu Yuan.
A．that
B．which
C．when
D．where
单项选择题
If it ______ for his bad cold, Rick would have enjoyed more on his birthday party.
A．is not
B．were not
C．has not been
D．had not been
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