单项选择题

She was running ______ balance, with her feet wrongly positioned.

A．on
B．in
C．off
D．over
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单项选择题
By ______ your work environment and personal practices, you may be able to reduce fatigue and discomfort.
A．adapt
B．adapting
C．having adapted
D．being adapted
单项选择题
Were it not for your help, I ______ in trouble now.
A．was
B．had been
C．were
D．would be
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