单项选择题

62（）

A．keep
B．preserve
C．bring
D．maintain

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单项选择题
61（）

A．come close to
B．take care of
C．do away with
D．make use of
单项选择题
They are climbing higher ______ they might get a better view.
A．provided that
B．so as to
C．in order that
D．now that
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