68 A beaver uses its strong front teeth to cut down trees and peel off _______ bark.
(A) its
(B) it’s
(C) they’re
(D) their

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統計: A(7), B(3), C(1), D(9), E(0) #2280365

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海狸用它強壯的門牙砍伐樹木並剝掉樹皮Be...
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