father is busy writing postcards this morning and /has written /ten so far.a :was writing b:has written; 为什么?

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fatherisbusywritingpostcardsthismorningand/haswritten/tensofar.a:waswritingb:haswritten;为什么?fatheris

father is busy writing postcards this morning and /has written /ten so far.a :was writing b:has written; 为什么?
father is busy writing postcards this morning and /has written /ten so far.
a :was writing b:has written; 为什么?

father is busy writing postcards this morning and /has written /ten so far.a :was writing b:has written; 为什么?
“今天上午父亲一直在忙着写明信片,到现在为止,已经写完10张了”.so far要用现在完成时.