根据汉语提示完成句子:They---(study)the map of the country before they left.我认为可能是had studied或studied,

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根据汉语提示完成句子:They---(study)the map of the country before they left.我认为可能是had studied或studied,
根据汉语提示完成句子:They---(study)the map of the country before they left.
我认为可能是had studied或studied,

根据汉语提示完成句子:They---(study)the map of the country before they left.我认为可能是had studied或studied,
had studied
study这一动作在left之前发生,所以用过去完成时.

They---(study)the map of the country before they left.
before they left. 因为有了BEFORE 尽量用完成时,更好.
had studied

were studying