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【参考答案】

将改为invaluable
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A．A round piece of stone.B．A heavy log.C．Two slices of log connected at their centers by a strong stick.D．A piece of metal.
单项选择题
When do the swallows return to San Juan Capistrano
A．In March.
B．In early summer.
C．In October.
D．In April.
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