填空题


【参考答案】

was：were
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at：for
单项选择题
A．He has climbed mountains using a stick.B．He has climbed mountains riding a horse.C．He has climbed mountains supported by a guider.D．He has climbed mountains using a system he devised himself.
A．He has climbed mountains using a stick.
B．He has climbed mountains riding a horse.
C．He has climbed mountains supported by a guider.
D．He has climbed mountains using a system he devised himself.
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