William Beebe, one of the first men ________ the depth of the sea in a bathysphere, got interested in oceanography because of one book.
A. exploring B. having exploring C. to be exploring D. to explore
William Beebe, one of the first men ________ the depth of the sea in a bathysphere, got interested in oceanography because of one book.
A. exploring B. having exploring C. to be exploring D. to explore
D