单项选择题

A．if
B．when
C．because
D．since
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单项选择题
A．skillfullyB．successfullyC．poorlyD．wonderfully
A．skillfully
B．successfully
C．poorly
D．wonderfully
单项选择题
A．narratedB．presentedC．maintainedD．explained
A．narrated
B．presented
C．maintained
D．explained
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