—Peter didn’t come to the meeting this morning. — I him yesterday but I was too busy and

问题补充：

—Peter didn’t come to the meeting this morning.

— I him yesterday, but I was too busy and forgot it.

A. should have told

B. should tell

C. had to tell

D. had told

答案：

(答案→)A. should have told

B. should tell

C. had to tell

D. had told

解析：考查时态.句意:今天早上彼得没来参加会议.——昨天我应该早点告诉他，但是我太忙，忘了。可知本句描述的现在应该已经完成的动作，故选A。