单项选择题

So complicated was the machine ______ only a skilled operator could use it.

A. that
B. so that
C. unless
D. until
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It was ______ day that he decided to study indoors.
A. so a cold
B. a so cold
C. such a cold
D. such cold a
单项选择题
______ men are most sure and arrogant, they are most commonly mistaken.
A. While
B. As
C. After
D. Since
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