Mary stays in China for 2 years.对 2 years划线提问是2 years 不是for 2 years

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Mary stays in China for 2 years.对 2 years划线提问是2 years  不是for 2 years

Mary stays in China for 2 years.对 2 years划线提问是2 years 不是for 2 years
Mary stays in China for 2 years.对 2 years划线提问
是2 years 不是for 2 years

Mary stays in China for 2 years.对 2 years划线提问是2 years 不是for 2 years
How long does Mary stay in China?
How many years does Mary stay in China?

How long does Mary stay in China?

How many years does Mary stay in China?
OR
How long does Mary stay in China?