looking 前半部分是完整的英语句子,所以逗号后面的部分只能做这个句子的修饰成分,因此只能用look的非谓语动词形式,即looking 或looked.而look的逻辑主语是they,主动发出的动作,因此用looking.
they lay on the beach,_____(look)up into the blue sky
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