单项选择题

Dried leaves continue to hang on the branches of some deciduous trees _________ the new leaves appear.

A．until
B．by
C．that
D．from
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单项选择题
For the success of the project, the company should _________ the most of the opportunities at hand.
A．obtain
B．grasp
C．catch
D．make
单项选择题
_________, ozone levels in the ionosphere appear to have dropped recently.
A．However the reason
B．It is the reason
C．What is the reason
D．whatever the reason
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