Thank you for ( )your letter. A.write B.writingC.to write D.is writing

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Thank you for ( )your letter. A.write B.writingC.to write D.is writing
Thank you for ( )your letter. A.write B.writingC.to write D.is writing

Thank you for ( )your letter. A.write B.writingC.to write D.is writing
B
for是介词,后面必须接doing
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