It was difficult for me to this morning because I slept too late last night.A. wake upB.

问题补充：

It was difficult for me to this morning because I slept too late last night.

A. wake up

B. go up

C. pull up

D. pick up

答案：

(答案→)A. wake up

B. go up

C. pull up

D. pick up

解析： 本题的后半句的含义是我昨天晚上睡的太晚了，那么今天早晨醒来早应该是难的，wake up表示醒来，故本题选A。