单项选择题

The real trouble ______ their lack of confidence in their abilities.

A．lies in
B．lies on
C．results in
D．leads to
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单项选择题
She is always ______ of others.
A．considered
B．considerate
C．considering
D．considerable
单项选择题
______ that the trade between the two countries reached its highest point.
A．During the 1980's
B．That it was in the 1980's
C．It was in the 1980's
D．It was the 1980's
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