单项选择题

Few people realized then __________ until two years later.

A．how this mistake was serious
B．how serious was his mistake
C．what serious mistake it was
D．how serious his mistake was
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单项选择题
Little __________ to meet you here.
A．did I expect
B．I expected
C．I did expect
D．had I expected
单项选择题
He prefers to live with his mother rather than __________ her alone.
A．to leave
B．leaving
C．leave
D．leaves
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