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

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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
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

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
选C,这是疑问代词+不定式的用法

c