单项选择题

______ their homework, the children went for a walk.

A．When they were doing
B．After they have done
C．Having done
D．received...didn't accept

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单项选择题

According to the passage, a pacing device ______ .

A．is used to time a student’s reading speed
B．is not used in most, speed reading courses
C．is used as an aid to vocabulary learning
D．should be used whenever we read alone

单项选择题

A．Not
B．No
C．None
D．Nor

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