Articles used by patients must be disinfected before _____ others.A.using B.being used by C.used by D.being using 请问为什么不选C,..

Articles used by patients must be disinfected before _____ others.A.using B.being used by C.used by D.being using 请问为什么不选C,.. pat by used by be used by songs和poems和Articles是什么意思From/By又是什么意思 used for 和used by的用法 the headings of articles used in this agreement are inserted for convenience of reference only used for used of used by used with used as 意思 used by others是什么意思i 英语翻译for instance,compared English research articles by Anglo-American linguists with Bulgarian and English research articles by Bulgarian linguists and identified considerable differences among the three sets of articles in the use of hedges lots of people like reading articles （ ）HanHan A：by B：to C：with D：for lots of people like reading articles （ ）HanHan A：by B：to C：with D：for by compensation trade,we mean to pay for your machines with articles produce.中文意思? be used as 和 be used by 区别 PAT怎么样 PAT怎么样? Pat是什么 PAT是什么意思