Mary does her homework at seven o' clock.划线部分提问,画线部分是 at seven o' clock

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Mary does her homework at seven o' clock.划线部分提问,画线部分是 at seven o' clock

Mary does her homework at seven o' clock.划线部分提问,画线部分是 at seven o' clock
Mary does her homework at seven o' clock.划线部分提问,画线部分是 at seven o' clock

Mary does her homework at seven o' clock.划线部分提问,画线部分是 at seven o' clock
When does Mary do her homework?=What time does mary do her homework?
一般第一种更常见,当然第二种也是正确的

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