如题所述
it is difficu (cross)the rive适当形式填空
是：
it is difficult (cross) the rive 吧
应该是：
it is difficult (to cross) the rive
意思是：
横（渡）过这条河很难
it is difficult to do，惯用法，做某事很难。
是：
it is difficult (cross) the rive 吧
应该是：
it is difficult (to cross) the rive
意思是：
横（渡）过这条河很难
it is difficult to do，惯用法，做某事很难。
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