I had not seen him for years,but I_________ his voice on the phone.

1. A.
   realized
2. B.
   heard
3. C.
   discovered
4. D.
   recognized

I had not seen him for years,but I_________ his voice on the phone.
A. realized                       B. heard
C. discovered                     D. recognized

I had not seen him for years,but I_________ his voice on the phone.

A.realized                       B.heard

C.discovered                     D.recognized

 I hadn’t seen him for ages, but I ______ his voice on the telephone at once.

   A. realized       B. recognized      C. heard         D. discovered

We haven't seen each other for many years, but I ______________ his voice on the phone at once.

[    ]

A. realized   B. understood   C. recognized   D. discovered