David was quick at learning new jobs, but hopeless about______them, and he soon became bored with anything he was capable of doing well. A．to keep B．to keeping C．keep D．keeping
A. A．to B.to C.keep D．keeping
【参考答案】
D 本题考查非谓语动词，hopelessabout后面要求用动名词。题意为，戴维学习新的工作很快，但是无望坚持，......