单项选择题

I'd like to ______ this old ear for a new model but I can't afford it.

A．interchange
B．exchange
C．replace
D．convert
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单项选择题
It was all I could do to ______ my anger.
A．cover
B．hide
C．enclose
D．Suppress
单项选择题
A competitor may submit any number of entries, ______ each one is accompanied by a pack et top.
A．guaranteeing
B．allowing
C．insuring
D．providing
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