WHILE HE DEALT WITH THE DEAF AND INVESTIGATINGTHE SCIENCE OF ACOU...

117. - 300 Câu tìm lỗi sai ôn thi THPT Quốc Gia 2021 môn Anh có đáp án

Tiếng Anh 300 Câu tìm lỗi sai ôn thi THPT Quốc Gia 2021 môn Anh có đáp án

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117. While he dealt with the deaf and investigatingthe science of acoustics, his studies

eventually led to the inventionof the multiple telegraph and his greatest invention - the

telephone.

a. dealt

b. investigating

c. eventually

d. invention