问题描述：
21.______ from the moon,the earth is just like a bigsphere.
21.______ from the moon,the earth is just like a bigsphere.
A)looked at
B)to look at
C)looking at
D)looking
21.______ from the moon,the earth is just like a bigsphere.
A)looked at
B)to look at
C)looking at
D)looking
问题解答：
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