单项选择题

Don't lose heart. It will not be long ______ you catch up with others.

A．since
B．until
C．when
D．before
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单项选择题
It is ______ whether Sam will come to attend his best friend's funeral as he has taken the town's money and made off with it.
A．unlikely
B．doubtful
C．improbable
D．unexpected
单项选择题
At the party we found that shy girl ______ her mother all the time.
A．depending on
B．coinciding with
C．adhering to
D．clinging to
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