The little boy was so careless with his spelling that she often letters from words.
A. left out
B. left behind
C. left off
D. let alone
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(答案→)A. left out
B. left behind
C. left off
D. let alone
解析：考查短语辨析。left out 漏掉，left behind 落在后面，left off 使终止，let alone更不必说，句意：对于他的拼写这个小男孩如此的粗心以至于他经常单词的字母。所以选A。