Some of the students have already learned enough English to a conversation with a native English speaker.
A. hold on
B. keep on
C. go on
D. carry on
网友回答
A. hold on
B. keep on
C. go on
(答案→)D. carry on
解析：选项A、B、C三个动词短语都表示继续之意，与题干中名词a conversation with a native English speaker构成短语，不符句意。