作业帮单项选择 What is this,plese?---It is UFO.A.a B.an C.the D\
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单项选择 What is this,plese?---It is UFO.A.a B.an C.the D\
单项选择 What is this,plese?---It is UFO.A.a B.an C.the D\
单项选择 What is this,plese?---It is UFO.A.a B.an C.the D\
a
A
D
一些特殊名词前不用加冠词，比如人名等
D