这个空要填非谓语动词应该是没有疑问的
由于主语是the earth,地球,地球与观察的关系是被动的,所以选A
补全就是：When the earth is looked at from the moon,the earth is just like a big sphere.
当在月球上看地球时,地球看起来就像颗很大的球
21.______ from the moon,the earth is just like a bigsphere.
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