单项选择题

I'm (old enough) (not to) let my troubles (to interfere) (with) my work.

A．old enough
B．not to
C．to interfere
D．with
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单项选择题
There was no ____ in arguing with him since he didn't agree with you.
A．cause
B．time
C．use
D．motive
单项选择题
He would rather die with his head high than ______ with his knees bent.
A．to live
B．living
C．live
D．lived
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