Tom can not walk fast cecame he is carring a heavy box对吗?
问题描述：
Tom can not walk fast cecame he is carring a heavy box对吗?
标准答案是：Tom can not walk fast becease he carries a heavy box.我怀疑答案错了。如果标准答案是对的，请说明理由。
答
应该是
Tom can not walk fast because he is carring a heavy box.