题目内容：

Some of the students have already learned enough English to ___ on a conversation with .
Some of the students have already learned enough English to ___ on a conversation with native English speakers.
(A) hold (B) keep
(C) go (D) carry
并请说明另外三个不对的原因,

优质解答

选D.
carry on a conversation:进行交谈.可以看成固定词组.
hold on:保持,keep on:继续,go on:发生,进展.这三个词组都和conversation 不搭配.