单项选择题

The police ran ______ all possible leads in the case.

A．in
B．up
C．against
D．down
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单项选择题
Water is an essential global resource and it is up to each of us to ______ it.
A．preserve
B．maintain
C．reserve
D．conserve
单项选择题
How I wish you ______ her everything! She almost cried her heart out.
A．did not tell
B．had not told
C．were not telling
D．are not telling
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