What's this?It's( ) UFO.A.a B.an C.the D./无

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What's this?It's( ) UFO.A.a B.an C.the D./无
What's this?It's( ) UFO.A.a B.an C.the D./
无

What's this?It's( ) UFO.A.a B.an C.the D./无
选A 不能选B,因为U的发音不是元音