After the war, a new school building was put up ______there had once been a theatre.

A．when

B．in which

C．the place where

D．where

男性，70岁。余留牙影响义齿修复求拔除。患者曾患过脑栓塞，长期服用阿司匹林。为防止拔牙术后出血应查（）

A.X线片检查

B.血常规检查

C.血小板计数

D.凝血酶原时间

E.心电图检查