8----The professor gave a lecture _____the international relationship.A for B on C to D with (B)

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8----The professor gave a lecture _____the international relationship.A for B on C to D with (B)
8----The professor gave a lecture _____the international relationship.A for B on C to D with (B)

8----The professor gave a lecture _____the international relationship.A for B on C to D with (B)
a lecture on
表示这个演说是关于 国际关系的
所以用on 表示关于

on 话题用on

on 教授讲了一节关于国际关系的课程。