117. While he d e a lt with the deaf and i n v e sti g a ti n gthe science of acoustics, his studies e v en t ua lly led to the i n v en ti o nof the multiple telegraph and his greatest invention - the telephone.a. dealt b. investigating c. eventually d. invention

WHILE HE D E A LT WITH THE DEAF AND I N V E STI G A TI N GTHE SCI...

300 CAU TRAC NGHIEM XAC DINH LOI SAI

117. While he d e a lt with the deaf and i n v e sti

g a ti

n gthe science of acoustics, his studies e v en

t ua

lly led to the

i n v en

o nof the multiple telegraph and his greatest invention - the telephone.

a. dealt

b. investigating

c. eventually

d. invention