Peter has an book.A. interestingB. funC. boringD. difficult.

问题补充：

Peter has an book.

A. interesting

B. fun

C. boring

D. difficult.

答案：

(答案→)A. interesting

B. fun

C. boring

D. difficult.

解析：句意：Peter有本很有趣的书。从冠词an得知，后面的词的读音要以元音开头，故选A有趣的；其他选项读音都是以辅音开头。B有趣的；C无聊的；D困难的。