I know of a number of occasions ____ people died from water pollution.空格里填when,那么整句话怎么翻译呢?occasion在句中又是怎么理解的呢?

I am afraid so.I do not know Ann's telephone number.As a matter of fact,I do not know any 那错了 If I only know the P.O.Box number,can I deliver to it. I know his telephone number. I don'd know A,how many his telephone number B,what is his telephone number 定语从句题目I know of a number of occasions --------people died from water pollution划线处填when,整句话怎么理解呢? The number of people which lost homes reached as many as 2500.这个句子是否正the number of意为“……的数目”；a number of 意为“许多”（＝many）、“若干”.例如：I want to know the number of the motor-vehicles.我想 the number of,a small number of,a number of. I don't know the ___ number of the students ____(exact) i know small is the o( )of big a number of the number of I know a lot of是什么意思? 急 I spend____time reading every day.A.a lot of B.a number of C.many D.the number of a growing number of a.number.of?用法 a small number of a number of 造句 a number of同义词 After a number of