The professor asked a question，and David______a good answer.
A．put up with
B．stood up for
C．came up with
D．looked down upon
正确答案：C
解析：教授问了个问题David给出来了一个很好的回答comeupwith[无被动语态]：提出想出；putupwith：忍受；standupfor：支持；lookdownupon：轻视
TheprofessoraskedaquestionandDavid______agoodanswer
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