单项选择题

A．whether
B．if
C．that
D．although
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单项选择题
A．attentiveB．interestingC．effectiveD．difficult
A．attentive
B．interesting
C．effective
D．difficult
单项选择题
A．appointedB．assignedC．imposedD．based
A．appointed
B．assigned
C．imposed
D．based
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