单项填空---Haveyouheardthat

问题详情：

单项填空

---Have you heard that ______ UFO landed on Center Street yesterday?

  ---Of course _____alien got out of the UFO and visited the TV station.

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

【回答】

C

知识点：情态动词

题型：选择题