– You seem to have learnt it by heart.--- Yes I.A. seemB. haveC. doD. did

问题补充：

– You seem to have learnt it by heart.

--- Yes, I.

A. seem

B. have

C. do

D. did

答案：

A. seem

(答案→)B. have

C. do

D. did

解析：此题考察不定式的省略，当不定式后跟完成式时要保留have，“你看起来用心学过。”“是的，我用心学过。”答案B。