The moon is____of years old.A.million B.millions

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Themoonis____ofyearsold.A.millionB.millionsThemoonis____ofyearsold.A.millionB.millionsThemoonis____o

The moon is____of years old.A.million B.millions
The moon is____of years old.A.million B.millions

The moon is____of years old.A.million B.millions
B.millions
millions of 数百万的.是固定搭配,一定要用复数millions.
句意:月球存在数百万年了.