My grandfather spends most of his time because he loves nature. A. outdoorB. outdoorsC. i

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A. outdoor
(答案→)B. outdoors
C. indoor
D. indoors
解析：词义辨析。Outdoor adj 户外的；indoor adj 室内的；outdoors adv室外；indoors adv 室外地；本题需要使用副词修饰spends most of his time,排除AC。句意：因为热爱自然，我的祖父大部分时间都是在户外度过的。故B正确。