单项选择题

He said it was impossible for______ a mistake in a computer' s calculation, so you can rely on that.

A．there being
B．there would be
C．there to be
D．there was
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单项选择题
A scientist usually directs his attention towards problems which he notices have no satisfactory explanation, and his curiosity makes him look for______ relationship even if the data available seem to be unconnected.
A．underlining
B．underneath
C．undergoing
D．underlying
单项选择题
There are several possible explanations for the greater job stability in Japan______ the great job mobility in the United States.
A．contrary to
B．in regard to
C．in contrast to
D．with respect to
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