单项选择题

The World Trade Center, the top ______ was 410 meters high, .was the tallest building in the world.

A．which
B．of which
C．of whose
D．that
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单项选择题
Another big issue ______ the new republic is the problem of the education of its citizens.
A．confining
B．confirming
C．conforming
D．confronting
单项选择题
______, he swore that he was not asleep.
A．Although I had difficulty in waking him
B．Since I had difficulty in waking him
C．Being difficulty in waking him
D．Even if I had difficulty in waking him
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