Tony hurt his knees ____(play soccer).这一题是用括号内的短语的适当形式填空~=
问题描述：
Tony hurt his knees ____(play soccer).
这一题是用括号内的短语的适当形式填空~=
答
to play soccer ！
不定式做目的状语、、、
答
playing soccer 可以相当于进行时。
亲：祝你学习进步！望采纳，谢谢！
Happy New Year！
答
填 playing
这里 playing = while playing = while he was playing
答
原句是：
Tony hurt his knees (when he was) playing football。
然后把括号里的内容去掉就是答案。
即playing soccer。
-------------------------------------------------------
如对回答满意，望采纳。
如不明白，可以追问。
祝学习进步！O(∩_∩)O~