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
We could do nothing but ______ till he came back.
A．to wait
B．waiting
C．wait
D．waited
单项选择题
______ tomorrow, she would get there on Sunday.
A．Would she leave
B．If she leaves
C．Were she to leave
D．If she had left
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