单项选择题

Most good writers use every means ______ to make the reader' s way smooth and easy.

A．at their disposal
B．at their request
C．at their will
D．at their convenience
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单项选择题
Water fills the ______ in the ground.
A．depression
B．distress
C．depressions
D．prosperity
单项选择题
Even as a child he showed an inclination to ______ over the other children.
A．dominate
B．rule
C．govern
D．inspect
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