which one to chooseto choose 充当什么成分

问题描述:

which one to choose
to choose 充当什么成分

which one to choose宾补。省略句,省去了主语。口语中可以单独使用。

which one to choose是不能单独成句的,它一般这样用:Can you tell me which one to choose?
这时which one to choose是一个带疑问词的动词不定式短语,在句中作直接宾语。
上句中which one to choose是可以和which one I should choose替换的。

补语,补充说明...
to do something后的do一般是宾语补足语.