膝上截肢（）
A.训练26～30次
B.训练18～22次
C.训练12～15次
D.训练6～8周
E.训练8～12周
参考答案：B
193. Every time before a meal the little child _____ the chairs for his family.
A．laid
B．lays
C．lay
D．lied
礁后相
