用be previous to造句

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用be previous to造句
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用be previous to造句
用be previous to造句

用be previous to造句
be previous to
之前
Enough materials should be collected previous to writing.
写作之前要收集足够的材料.
The new pandemic H1N1 actually turns out to be related to previous pandemic strains.
新的流行性的H1N1实际上已经变得和以前的流行的变种有关系.

用be previous to造句 用'to be'造句 previous to 用be going to造句 用be up to造句 用be used to造句 用be going to造句 用be bound to 造句 用used to be 造句 用to be specific造句 用 be beginning to造句~ 用be able to造句 用 be similar to 造句 用be ashamed to造句 用be going to造句 要十句 用《sb be made to sth》造句? 用 be hurried to do 造句 英语 用be lucky enough to do造句