how long( )you( )a doctor?Three years A ,have:been B,have:become C,did he D,are:不填这个选哪个啊?

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how long( )you( )a doctor?Three years A ,have:been B,have:become C,did he D,are:不填这个选哪个啊?

how long( )you( )a doctor?Three years A ,have:been B,have:become C,did he D,are:不填这个选哪个啊?
how long( )you( )a doctor?Three years A ,have:been B,have:become C,did he D,are:不填
这个选哪个啊?

how long( )you( )a doctor?Three years A ,have:been B,have:become C,did he D,are:不填这个选哪个啊?
选A.答语是时间段,故用how long提问,且此句意思为你当医生多久了,表示现在完成时,所以用have:been

A

A
how long 提问时间“……多久了”,后面要用延续性的动词表示状态,所以选择A
你作为一个医生已经多久了?
三年。

A ,have:been

A
have 不用解释吧
become,成为,该动词是不可延续性动词,所以不能用现在完成时态

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