牙钳的组成包括（）
A.钳喙
B.钳柄
C.刃
D.关节
E.杆
参考答案：A, B, D
No one can tell how many sufferings the kidnapped boy ________ when he was rescued yesterday.
A．had
B．has had
C．had had
D．would have
《九歌》（）
A．是根据民间祭祀歌舞加工而成的
B．是宋玉代表作
C．共包括9篇
D．共包括11篇
