单项选择题

After a lot of difficulties, Geoffrey ______ to open the door.

A．succeeded
B．gained
C．obtained
D．managed
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单项选择题
You can stay in my room ______ you promise not to use the computer.
A．so far as
B．except
C．unless
D．provided
单项选择题
That book ______ color is blue belongs to me.
A．which
B．what
C．that
D．whose
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