WhenIwasdoingadictation,Ileftout

问题详情：

 When I was doing a dictation, I left out ____ “u” in the word butter and ____ “n” in the word dinner.

A. a, an                        B. a, a                      C. the, a                   D. the, an

【回答】

D

知识点：冠词

题型：选择题