作业帮It's difficult__________a bridge in the village A build B builds C building D to build
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It's difficult__________a bridge in the village A build B builds C building D to build
It's difficult__________a bridge in the village A build B builds C building D to build
It's difficult__________a bridge in the village A build B builds C building D to build
it's difficult to do sth.做某事很难
是为固定用法,所以选D