单项选择题

The heating system has recently been _______ to make it more efficient.

A．modified
B．amended
C．altered
D．changed
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单项选择题
She once again went through her composition carefully to _______ all spelling mistakes from it.
A．eliminate
B．diminish
C．delete
D．withdraw
单项选择题
Their wedding will be quite an _______ i.e. a large number of people will attend.
A．accident
B．occurrence
C．incident
D．event
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