c
好像是宾语省略 保留到介词
the ice is too thin ------ A to skate on it B skating on it C to skate on D skating on
the ice is too thin ------ A to skate on it B skating on it C to skate on D skating on
可不可以加it
可不可以加it
英语人气：223 ℃时间：2019-09-23 09:16:01
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