单项选择题

A．learned
B．learn
C．be learned
D．learning
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单项选择题
A．willingnessB．willingC．willpowerD．weakness
A．willingness
B．willing
C．willpower
D．weakness
单项选择题
A．teachB．deliverC．giveD．learn
A．teach
B．deliver
C．give
D．learn
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