问题
选择题
31．Children above 12 are able to take part in skiing or other activities____for them.
A．having designed
B．designing
C．to design
D．Designed
答案
答案：D
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31．Children above 12 are able to take part in skiing or other activities____for them.
A．having designed
B．designing
C．to design
D．Designed
答案：D