[单项选择]With high hopes, the company sent samples of the substance to scientists, but they couldn't（）any practical uses for it
A. come up with
B. do justice to
C. get even with
D. look up to

Scientists say they have high hopes for a drug that could one day provide a new form of treatment for HIV-A1DS. A compound, which interferes with an elusive protein used by the HIV virus to infect human cells, has worked extremely well in monkeys. If the drug proves effective in human trials, scientists say, it could bolster (加强) the effectiveness of two existing AIDS drugs, particularly in fighting drug-resistant strains of the virus.
Researchers at the pharmaceutical (制药的) company Merck are very excited about an experimental drug, which has worked as well in monkeys infected with a primate version of the virus as any of the existing anti-AIDS drugs.
It works by blocking one of three proteins, or enzymes, the HIV virus uses to gain entrance into and infect human immune system cells.
Inhibitor drugs have been developed to block two of the proteins, to slow progression of the disease after infection. They have become standard thera