(1) cross 问题
原本的词组是see sb do sth
因为当不含to的词组改成被动时要加to,所以才会出现to cross.
如：His father made him recite the poem.
被动要加to,变成：He was made to recite the poem.
(2) 解答crossing问题
可以改成crossing,因为see还有一个词组：see sb doing sth
而doing的词组在改成被动时不需要加to,所以也可以使用crossing
He was seen to cross the street when a car bumped into him.中
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