单选题 He is accustomed ______ late on weekends for he has the habit of working at night.

[A] to sit up
[B] to sitting up
[C] at sitting up
[D] for sitting up

【正确答案】 B

【答案解析】[名师精解] be accustomed to/used to习惯于……。在这个短语中，to为介词，其后接名词或动名词。
[解题秘籍] 有些动词词组后要跟动名词，如：be used to, be accustomed to(习惯于)， be dedicated to, be committed to(致力于)等。