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

问题描述:

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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