Perhaps most puzzling of all, _____ able to make sense of _____ we heard and distinguish the mistakes and errors from “good” language?

A．what we were, something

B．how were we, what

C．why we were, things

D．why were we, that

关于普萘洛尔抗心绞痛方面，哪项错误（）

A.对变异性心绞痛效果好

B.与硝酸甘油合用效果好

C.对兼有高血压的效果好

D.久用后不宜突然停药

E.对稳定型和不稳定型的都有效