Question

i don't know which one to choose

Answer 1

which one to choose是wh- to do 结构,不是从句.

1.该结构起名词作用,作主语、宾语、表语、同位语.

I didn't know how to choose .

2.wh-词如果是副词,如wherewhenhow等,作to do 的状语；如果是代词,如whatwhose 等,作to do 的宾语或宾语的定语.

I don't know which book to choose.

I don't know what to choose.