单项选择题

Geologists use special equipment to ______ the existence of valuable minerals beneath the earth' s surface.

A．inspect
B．detect
C．indicate
D．evaluate
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单项选择题
He left his mountain village and worked in the town. The least he could do is ______ his parents once in a while.
A．write to
B．wrote to
C．to write to
D．be writing to
单项选择题
By the time we hurried through the heavy traffic to the airport, the plane ______.
A．was taking off
B．would take off
C．had taken off
D．took off
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