题目内容
根据句意和提示写出单词，完成句子。
There is a truck ________(collect)litter outside now, then it will carry all the litter out of the city．
答案：collecting
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题目内容
根据句意和提示写出单词，完成句子。
There is a truck ________(collect)litter outside now, then it will carry all the litter out of the city．