单项选择题

Antarctica, as the world's coldest continent, isn't easily ______.

A．to reach
B．reaching
C．reached
D．reach
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单项选择题
It was the training that he had as a young man ______ led to his success.
A．that
B．it
C．which
D．who
单项选择题
--Are you satisfied with what she has done--Not a little. It couldn't be ______.
A．any better
B．any worse
C．the best
D．the worst
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