We couldn’t cut the string because the ______ of the knife was not sharp enough.

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问题 We couldn’t cut the string because the ______ of the knife was not sharp enough.

选项 A、blade
B、edge
C、side
D、front

答案B

解析 edge n.刀口,刃;边缘,棱。blade n.刀片,刀刃。
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