Unit18LanguagePoints新教材课件
日期:2010-05-24 05:05
1 If so, what and why?
if so : 要是这样的话
Is the book available, and if so where?
类似的短语: if not
if necessary
if possible
if and when
Taste the soup and add salt and pepper if necessary
I want to get back by five oclock if possible
I think,
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