单项选择题

Outside my office window, there is fire _______ on the right.

A．ladder
B．escape
C．steps
D．stairs
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单项选择题
A tariff is a customarily collected tax on goods _______ in to a country.
A．come
B．coming
C．came
D．have coming
单项选择题
The title of the book was on the _______ of my tongue, but I just could not think of it.
A．end
B．tip
C．back
D．point
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