单项选择题

I felt somewhat disappointed and was about to leave, something occurred which attracted my attention.

A．unless
B．when
C．until
D．while
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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
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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