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
Breakfast in the school canteen usually ______ egg, bread, and milk
A．consists of
B．is consisted of
C．makes up
D．is included
单项选择题
This light bulb doesn t work. Can you ______ it by another one
A．substitute
B．replace
C．change
D．exchange
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