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補(bǔ)全短文

Pain can take complete control of our body and mind， making it impossible to move and even to think. Yet we need pain. Without it， we would not know if we have hurt ourselves. It is our body's Warning system. ________.

A.It tells us that we are injured and should do something about it.

B.And they send the second， slower message of pain to the brain.

C.All of us have felt pain.

D.Some of us suffer pain rarely.

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