单项选择题
When writing a biography of Napoleon she some unknown facts.
A．stumbled across
B．stumbled through
C．stumbled at
D．stumbled over
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单项选择题
My answer to the quiz question “Who composed the Midnight Sonata”was just a shot in the . I didn't really know it was Beethoven.
A．night
B．air
C．dark
D．distance
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单项选择题
I'm whether or not to go to Greece for the summer.
A．on second thoughts
B．on the spot
C．in the process
D．in two minds
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