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Along with the letter was his promise ___ he was free he would visit me the coming month.

A. what              B. that            C. that if               D. whether

Along with the letter was his promise ___ he was free he would visit me the coming month．

A．what            B．that           C．that if             D．whether

 Along with the letter was his promise ___ he was free he would visit me the coming month.

A. what               B. that             C. that if               D. whether