单项选择题

A．They know very well what their trunks are for.
B．They know very well what their teeth are for.
C．They don’t seem to know what their trunks are for.
D．They don’t seem to know what their teeth are for.
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单项选择题
A．Playing volleyball.B．Skating.C．Swimming.D．Watching TV.
A．Playing volleyball.
B．Skating.
C．Swimming.
D．Watching TV.
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