1 . He started to________ (sharp) his knife. (所给词的适当形式填空)
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2 . My pencil is blunt. Could you lend me a knife to ________ it?
A.sharpen | B.strengthen | C.smooth | D.threaten |
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3 . After many years of wearing, the knife needs s________ .(根据首字母单词拼写)
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