在改写后的句子中填入适当的词,使其与原局意思相同或相近

问题描述:

在改写后的句子中填入适当的词,使其与原局意思相同或相近
I have not got any letters from him for three weeks.
It---- ---- ---- since I ---- ---- him last

It is three weeks since I heard from him last