问题
选择题
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
答案
答案：A
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。