Odpowiedź :
Odpowiedź:
1. c
2. a, c
3.
have known
haven't met them
4.
The boys have been playing computer games since breakfast.
How long have you been going out with Mark?
She has been trying to solve the math problem for an hour.
Wyjaśnienie:
Odpowiedź:
1. c
2. a, c
3.
have known
haven't met them
4.
The boys have been playing computer games since breakfast.
How long have you been going out with Mark?
She has been trying to solve the math problem for an hour.
Wyjaśnienie: