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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Proper clothes ______ for much in business. That's why you see most business people dress formally.
A．count
B．account
C．allow
D．care
单项选择题
The police ______ to emergencies in just a few minutes when the accident happened.
A．responded
B．replied
C．adjusted
D．appealed
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