單項選擇。
They ______ the countryside and walked in the mountains.

A. explores
B. explored
C. are exploring
D. explore
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科目：初中英語 來源：同步題 題型：單選題

單項選擇。
They ______ the countryside and walked in the mountains.
[     ]
A. explores
B. explored
C. are exploring
D. explore

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