问题补充:
The little boy was so careless with his spelling that he often letters from words.
A. left out
B. left behind
C. left off
D. let alone
答案:
A. left out
B. left behind
C. left off
D. let alone
解析:A
解析考查动词短语辨析。leave out遗漏;leave behind留下,遗留;leave off停止,中断;let alone更不用说。依据前面提及的careless可知,这里应该是将单词的字母遗漏了。故选A项。