题干
Why not ________ an English Club to practice ________ English?
A：to join; speaking
B：join; speaking
C：join; to speak
D：to join; to speak
答案(点此获取答案解析）
B
Why not ________ an English Club to practice ________ English?
A：to join; speaking
B：join; speaking
C：join; to speak
D：to join; to speak
是异亮氨酸分子的C与H比是（ ）