单项选择题

The traffic was very heavy, () I would have been here half an hour sooner.

A.however
B.otherwise
C.anyway
D.although

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单项选择题

Trial and error () the source of our knowledge.

A.is
B.are
C.has been
D.have been

单项选择题

There are a lot of bitter stories () his success.

A.after
B.behind
C.under
D.down

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