联想电脑蓝屏怎么解决:which sentence is wrong?

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A. I haven't seen him since last time I met him in the street.
B. He has come back for one month.
请说明哪句错，错在哪。

在现在完成时的否定句中可以用短暂性动词,但在肯定句中不能.
He has come back for one month. (错)come是短暂性动词
He has been back for one month. (对)been是延续性动词

B
应该用延续性动词

B；He has came back for one month.

都没错

B

which sentence is wrong? which sentence is correct? which sentence is right,why? Which sentence is correct? Why? is this sentence correct? is this sentence correct Is this right sentence? Is this right sentence? WR thread 1 is opened 什么意思？ Which is false?