look backHe often stopped at the sound of his own steps and was afraid to look ____ his shoulder.a.over b.back我觉得应该是back,可是答案是A．．．为什么?

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• look backHe often stopped at the sound of his own steps and was afraid to look ____ his shoulder.a.over b.back我觉得应该是back,可是答案是A．．．为什么?
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