单项选择题

There are several theories as to why the dinosaurs become ______.

A．extinct
B．credible
C．distinct
D．esthetic
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单项选择题
He' s so crazy about her that he doesn' t realize he' s being ______.
A．manifested
B．magnified
C．manipulated
D．maintained
单项选择题
When the ______ is complete it will be at least two weeks before you receive your copy of the contract.
A．transition
B．transaction
C．transformation
D．transplantation
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