－It was the headmaster Tony. Youhello to him.－Sorry. I didn't notice him.A. must sayB. sh

问题补充：

－It was the headmaster, Tony. Youhello to him.

－Sorry. I didn notice him.

A. must say

B. should say

C. must have said

D. should have said

答案：

A. must say

B. should say

C. must have said

(答案→)D. should have said

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