单项选择题

He hadn't _______ quite what was wrong with .his mother. He knew, though, that she hadn't been well for some time now.

A．worked off
B．worked on
C．worked out
D．worked at
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单项选择题
The most typical feature of the Moon's surface is its _______ of carters, the largest of which are more than one hundred miles in diameter.
A．abundance
B．type
C．tolerance
D．depth
单项选择题
Limestone that can be highly polished is _______ marble.
A．substituted by
B．known as
C．regular as
D．improved by
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