It will be 20 years since Hong Kong returned to China on July 1，1997．（就划线部分提问）
years will it be since Hong Kong returned to China on July l，1997？
It will be 20 years since Hong Kong returned to China on July 1，1997．（就划线部分提问）
years will it be since Hong Kong returned to China on July l，1997？
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