They ()(study)the map of the country before they left for their holiday 动词填空.

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They ()(study)the map of the country before they left for their holiday 动词填空.

They ()(study)the map of the country before they left for their holiday 动词填空.
They ()(study)the map of the country before they left for their holiday 动词填空.

They ()(study)the map of the country before they left for their holiday 动词填空.
had studied
不明白的再问哟,请及时采纳,多谢!

had studied