∵sin（-17π3）=sin（6π-17π3）=sinπ3=32．
故选：B．
根据句意及首字母提示补全单词。
1. We've been doing experiments for 24 hours without a b_____.
2. F_____ , they caught the last bus last night.
3. Hosting the World Expo successfully was great e_____ in Chinese history.
4. Do you know when the Red Cross S_____ of China was founded?
5. Heroin (海洛因) is a kind of hard d_____.
6. All the students are present, nobody is a_____.
( ) .
A．
B．
C．
D．
