saithoca
Doçent
One of the most exciting discoveries in language acquisition research in recent years ---- the finding that the acquisition of grammatical structures ---- in a predictable order.
A) has been / proceeds
B) is / had to proceed
C) was / has been proceeding
D) could be / was proceeding
E) is / might proceed
A) has been / proceeds
B) is / had to proceed
C) was / has been proceeding
D) could be / was proceeding
E) is / might proceed