问题
选择题
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
答案
答案：D
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。