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
It was believed that the colonists would use profits from the sale of their pig iron to _______.
A．begin wool factories in America
B．pay the cost of high import taxes
C．purchase English woolen goods
D．manufacture iron products in America
单项选择题
English iron smelters and English iron manufacturers were both opposed to _______.
A．high import taxes on American pig iron
B．the growth of iron manufacturing in America
C．the shipping of iron products to America
D．selling English wool to the colonists
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