单项选择题

Do earthquakes ______ often in North America

A．break
B．break out
C．happen to
D．occur
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单项选择题
-- How much sugar is left
A．None
B．Nothing
C．Not many
D．Few
单项选择题
I like ______ the clouds at sunset because it seems relaxing.
A．watch
B．to watch
C．watched
D．watching
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