คำแนะนำของผู้เขียน
A good reference is M. Swan, "Practical English Usage" of which the 3rd edition (2005) was consulted to produce this worksheet.
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คำแนะนำของผู้เขียน
A good reference is M. Swan, "Practical English Usage" of which the 3rd edition (2005) was consulted to produce this worksheet.