We must do()our parents tell us 选哪个that if as which 请问选择哪个?

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We must do()our parents tell us 选哪个that if as which 请问选择哪个?

We must do()our parents tell us 选哪个that if as which 请问选择哪个?
We must do()our parents tell us 选哪个
that if as which
请问选择哪个?

We must do()our parents tell us 选哪个that if as which 请问选择哪个?
选择as,do后面缺宾语,而后面那句our parents tell us 也缺少宾语,所以that which if 均不可选.