A．Henry JamesB．John SteinbeckC．Sinclair LewisD．William ……

单项选择题Dr. Martin Luther King, ______, was assassinated in March 1968.

单项选择题Which of the following does NOT characterize a normal patent

单项选择题An inventor can generally make a big profit if he ______ his or her invention.

单项选择题A dead patent is one that ______.

单项选择题It can be inferred from the passage that ______.