Under what circumstances would Bob replace him

A．If he fell at that time.

B．If he failed the exam.

C．If he didn’t come in time.

D．If he asked in time.

抗高血压药最合理的联合是（）

A.氢氯噻嗪+硝苯地平+普萘洛尔

B.氢氯噻嗪+拉贝洛尔+普萘洛尔

C.肼屈嗪+地尔硫+普萘洛尔

D.肼屈嗪+哌唑嗪+普萘洛尔

E.硝苯地平+哌唑嗪+可乐定