单项选择题

______, he realized he made the right decision.

A. Before long
B. Long before
C. After
D. Before
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单项选择题
I wonder who drank all the milk yesterday. It ______ have been Peter because he was out all day.
A. mustn't
B. can't
C. won't
D. needn't
单项选择题
______ each other for 10 years, they decided to meet this year.
A. Not having seen
B. Having not seen
C. No seeing
D. Seeing not
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