单项选择题

The policy ______ made, the next problem was how to carry it out.

A．having been
B．being
C．had been
D．was
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单项选择题
Not until ______ himself seriously ill.
A．he had completed the task did he find
B．had he completed the task did he find
C．he completed the task had he found
D．did he complete the task he had found
单项选择题
Outside my office window, there is a fire ______ on the right.
A．ladder
B．escape
C．steps
D．stairs
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