they_____to write to each otherover 70 years ago

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they_____towritetoeachotherover70yearsagothey_____towritetoeachotherover70yearsagothey_____towriteto

they_____to write to each otherover 70 years ago
they_____to write to each otherover 70 years ago

they_____to write to each otherover 70 years ago
began
70多年前,他们就互通来信.