You should put them back after you use them.=You should put them back ___ ___ them
题目
You should put them back after you use them.=You should put them back ___ ___ them
答案
after using
after 可以做连词,后跟句子.也可以作为介词,后跟v-ing形式.
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我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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