单项选择题

The most important thing in providing first aid is to（）

A．call for an ambulance
B．prevent bleeding
C．know what to do
D．act quickly

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单项选择题
According to the passage, some injured or sick people died as a result of（）

A．other people's hesitation to offer first aid
B．unprofessional first aid
C．unnecessary first aid
D．unwise suggestion by by-standers
单项选择题
（）late in the evening that the party drew to an end.

A．It's not until
B．It was not until
C．It is till
D．It was until
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