I want to know more about Hong Kong．Can you tell me ________？（ ）
| A． |
when did it return to China |
| B． |
when it returned to China |
| C． |
When does it return to China |
| D． |
when it returns to China |
I want to know more about Hong Kong．Can you tell me ________？（ ）
| A． |
when did it return to China |
| B． |
when it returned to China |
| C． |
When does it return to China |
| D． |
when it returns to China |
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