单项选择题

A．direction
B．training
C．education
D．instruction
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单项选择题
A．whetherB．ifC．thatD．although
A．whether
B．if
C．that
D．although
单项选择题
A．attentiveB．interestingC．effectiveD．difficult
A．attentive
B．interesting
C．effective
D．difficult
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