单项选择题

Four hours ______, but we still labored along the muddy road in the rain.

A．elapsed
B．flapped
C．skipped
D．surpassed
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单项选择题
The medical center couldn't ______ which group the flu virus belonged to owing to the lack of more blood samples.
A．scan
B．discern
C．testify
D．disclose
单项选择题
The walls of the tunnel are designed to ______ heat.
A．aggregate
B．dissipate
C．radiate
D．segregate
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