单项选择题

He said that the driver must have had an accident; otherwise he （） by then.

A．would have arrived
B．must have arrived
C．should arrive
D．would arrive

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A fire engine must have priority as it usually has to deal with some kind of（）.

A．precaution
B．crisis
C．emergency
D．urgency
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Our manager is （） an important customer now and he will be back this afternoon.

A．calling on
B．calling in
C．calling up
D．calling for
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