单项选择题

21（）

A．Not
B．No
C．None
D．Nor

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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
The teacher will tell us ______ to have the exam next Monday.
A．if
B．that
C．if not
D．whether
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