单项选择题

He promised me a letter; he ought to ______ it days ago.

A．have written
B．write
C．had written
D．be writing
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单项选择题
The negotiations which ______ the signing of the treaty took place over a number of years.
A．preceded
B．prescribed
C．proceeded
D．processed
单项选择题
The Untied States and Canada are lands of ______ except for the Indians, who are the only true natives.
A．emigrants
B．immigrants
C．dwellers
D．inhabitants
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