单项选择 What is this,plese?---It is UFO.A.a B.an C.the D\
问题描述:
单项选择 What is this,plese?---It is UFO.A.a B.an C.the D\
答
a
单项选择 What is this,plese?---It is UFO.A.a B.an C.the D\
a