问题
选择题
Along with the letter was his promise _______ he would visit me this coming Christmas.
A．which
B．that
C．what
D．whether
答案
答案：B
that从句是对promise的解释、说明，不存在修饰作用，为同位语从句，故选B。如选A，应引导定语从句，起修饰作用。
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