单项选择题


A．exercises
B．defects
C．mistakes
D．tests
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单项选择题
A．previouslyB．rarelyC．merelyD．consistently
A．previously
B．rarely
C．merely
D．consistently
单项选择题
A．aboutB．noC．muchD．few
A．about
B．no
C．much
D．few
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