—Would you like to come to dinner tonight？ —I’d like to I’m too busy.A. and...B. soC. as

问题补充：

—Would you like to come to dinner tonight？

—I’d like to, I’m too busy.

A. and...

B. so

C. as...

D. but

答案：

A. and...

B. so

C. as...

(答案→)D. but

解析：.but表转折，符合语意。而表并列的and, 结果的so，原因的as都不符合句意。.