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Which is most common and less common in
1) conversation, 2) a business mail.
a. In case you need to return anything ~
b. If you need to return anything ~
c. If you should return anything ~
d. Should you return anything ~
2020年1月31日 18:31
修改 · 2
Thank you. :)
2020年1月31日
I would say a and d are more formal and can be used in a business letter. I would use b in conversation
2020年1月31日
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