she doesn't know ___ .A to take which stepshe doesn't know ___ .A to take which step B.to take step C which step to take D.to take the step 选择什么 为什么

问题描述:

she doesn't know ___ .A to take which step
she doesn't know ___ .A to take which step B.to take step C which step to take D.to take the step 选择什么 为什么

c

选C,这是疑问代词+不定式的用法