80. Last week we had a meeting. I told the chairman that I couldn’t attend it for I had s

问题补充：

80. Last week, we had a meeting. I told the chairman that I couldn’t attend it for I had something important to do, but he insisted my being present.

A. on

B. in

C. to

D. At

答案：

(答案→)A. on

B. in

C. to

D. At

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