单项选择题

The gas company ______ a leak in the main line and evacuated all the tenants of the building.

A．detected
B．inspected
C．discerned
D．explored
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单项选择题
The strange phenomenon has ______ and puzzled many scientists for more a century.
A．annoyed
B．embarrassed
C．fascinated
D．frustrated
单项选择题
This difficult problem we face in the project has to be tackled before we can ______ to others.
A．pursue
B．advocate
C．precede
D．proceed
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