If climate of the earth change的change要不要加s?是If climate of the earth change,还是If climate of the earth changes是?

If climate of the earth change的change要不要加s?是If climate of the earth change,还是If climate of the earth changes是?
If climate of the earth change的change要不要加s?
是If climate of the earth change,还是If climate of the earth changes是?

If climate of the earth change的change要不要加s?是If climate of the earth change,还是If climate of the earth changes是?
If climate of the earth changes
主语是 climate of the earth 所以用单三
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