40. _________ is a U-shaped link closed with a pin used for connecting purposes. Please choose the correct answer to complete the sentence.
(A) Cable
(B) Chain
(C) Shackle
(D) Wire

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統計： A(40), B(50), C(534), D(21), E(0) #2817076

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#5980537
一個U形的、用插銷閉合的環狀連結物，用於...

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