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
填空题
A．causedB．wishedC．guessedD．dressed
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