问题补充：
--I don’t have a partner to practice English.
--Why not join an English language club to practice?
A. /; speaking
B. with; to speak
C. /; to speak
D. with; speaking
答案：
A. /; speaking
B. with; to speak
C. /; to speak
(答案→)D. with; speaking
解析：I （主语） don’t have（谓语） a partner（宾语） to practice English with（句中的不定式作定语修饰a partner），词组是practice sth. with sb.和谁干什么事，故with不可省；practice doing sth 是固定短语。故选D。
