Not only ________ to determine the depth of the ocean floor, but it is also used to locate oil.
Đáp án B
Chủ điểm ngữ pháp: đảo ngữ với “not only”
Not only+ aux verb/be+ S+V/ adj/ adv+.. + but+ S+ also + v+...
Địa chấn học không chỉ được dùng để đo độ sâu của biển mà nó còn được dùng để xác định vị trí có dầu.
Ann's encouraging words gave me _________ to undertake the demanding task once again.
The local people insisted that the road_________50 cm more so that, in case of flood, they still can travel on it.
He did not share his secrets with other people but he ________in her.
The girl __________ design had been chosen stepped to the platform to receive the award.
My boss's plane___________at 10:15 tomorrow morning, but I cannot pick him up.