-what is the letter on the blackboard?-it is an() a.J b.G c.S(这是宁外的题)

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-whatistheletterontheblackboard?-itisan()a.Jb.Gc.S(这是宁外的题)-whatistheletterontheblackboard?-itisan()a

-what is the letter on the blackboard?-it is an() a.J b.G c.S(这是宁外的题)
-what is the letter on the blackboard?-it is an() a.J b.G c.S
(这是宁外的题)

-what is the letter on the blackboard?-it is an() a.J b.G c.S(这是宁外的题)
C

答案选 C ;
因为 S 的读音是 [es],元音开头,用冠词 an.