单项选择题

A．pursued
B．track
C．trace
D．follow
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单项选择题
A．remainedB．lastedC．keptD．left
A．remained
B．lasted
C．kept
D．left
单项选择题
A．exploredB．had exploredC．was exploringD．had been exploring
A．explored
B．had explored
C．was exploring
D．had been exploring
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