问题补充：
On Christmas Eve, children are eager to know Father Christmas comes and puts presents into their stockings．
A. that
B. what
C. where
D. how
答案：
A. that
B. what
C. where
(答案→)D. how
解析：句意：在圣诞前夜，孩子们渴望知道圣诞老人是怎么来怎么将礼物放进袜子里面的。这里know后面接的是宾语从句，宾语从句中不缺主宾表，缺少的是方式状语，所以选D。
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