I have no idea ______ we ______ hand in our papers after class.A.if; need B.whether; need to C.if; ought to D.that; dare选什么,BC如何区别?

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I have no idea ______ we ______ hand in our papers after class.A.if; need B.whether; need to C.if; ought to D.that; dare选什么,BC如何区别?
I have no idea ______ we ______ hand in our papers after class.
A.if; need B.whether; need to C.if; ought to D.that; dare
选什么,
BC如何区别?

I have no idea ______ we ______ hand in our papers after class.A.if; need B.whether; need to C.if; ought to D.that; dare选什么,BC如何区别?
B

C. if; ought to
是否应该上交
whether 通常和or not 连用表示是否