Tom _____ the USA. He _____ back in two months.[ ]A. has gone to; comes B. has gone to; will be C. has been to; comes D. has been to; will be-九年级英语
如：come，go，arrive，leave，join，become，die等。
8.一段时间+has passed+since从句
主语＋have / has been＋since短语
例如：He has been in the League for three years.
或It is three years since he joined the League. 他入团已三年了
9. 现在完成时常和短语 "up to now /till now","so far" （意思是从过去某一确定的时间一直延续到现在)连用。
Up to/till now he's read many story books. 至今他已读过好多故事书。
I've been to New York three times so far. 至今我已到纽约去过三次。
has gone (to),has been (to),has been (in) 的区别
has gone to：去了没回
has been to ：去过
has been in：呆了很久
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