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
The girl appeared ______ with the small world her parents had constructed for her.
A．sensitive
B．satisfactory
C．content
D．curious
单项选择题
You have to go to work on Sundays often, ______
A．doesn't he
B．don't you
C．mustn't you
D．haven't you
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