问题补充：
As we have much time left, lets discuss the matter tea and cake.
A. with
B. by
C. over
D. at
答案：
A. with
B. by
(答案→)C. over
D. at
解析：句意：因为还剩一些时间，让我们喝茶点时讨论这事。with和……一起；by通过；over在……期间；at在。这里表示在……期间，故选C。
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