【正确答案】:
THERE HAD BEEN A NUMBER OF CASES OF DIPHTHERIA IN MATILDA’S SCHOOL AND TWO OF THEM HAD BEEN DEAD. WHEN THE DOCTOR ARRIVED AT OLSON’S HOME, HE WANTED TO EXAMINE MATILDA’S THROAT FIRST. 
【题目解析】:考点:玛蒂尔达的学校:Matilda’s school;首先:first;检查:examine。句子结构:There be句型+时间状语从句,There be的过去完成时形式:There had been;when引导的时间状语从句,主句从句都用的是过去时态。