摘要：It is an UFO.

网址：http://m.1010jiajiao.com/timu3_id_2411824[举报]

It is _______ unusual thing for us to find ________ UFO.

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It is _______ unusual thing for us to find ________ UFO.

A．a; a B．an; an C．a; an D．an; a

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It is _______ unusual thing for us to find ________ UFO.

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It is _ unusual thing for us to find __ UFO.

A.
a; a
B.
an; an
C.
a; an
D.
an; a

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It is _____ unusual thing for us to find _____ UFO.

A. a; a
B. an; an
C. a; an
D. an; a

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