单项选择题

It is still not clear what ______ a series of argument between them.

A．contributed
B．marked
C．ignited
D．triggered
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单项选择题
The Great Wall is a great tourist ______ , drawing millions of visitors from all parts of the world every year.
A．attention
B．appointment
C．attraction
D．interest
单项选择题
Shy people never ______ set out to attract attention of other people.
A．willingly
B．voluntarily
C．decidedly
D．deliberately
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