单项选择题


A．involved
B．interested
C．participated
D．joined
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单项选择题
A．A hundred years ago.B．Three months ago.C．Fifty years ago.D．Five years ago.
A．A hundred years ago.
B．Three months ago.
C．Fifty years ago.
D．Five years ago.
单项选择题
A．Three years old.B．Before the age of three.C．Six and above.D．From three to six years old.
A．Three years old.
B．Before the age of three.
C．Six and above.
D．From three to six years old.
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