问题
填空题
用a或an填空，有的地方不用填。
①This is _____ orange.
②That is _____ jacket.
③It's _____ English book.
④This is _____ my pen.
⑤Is that _____ ruler?
⑥That ____orange is yellow.
答案
①an ②a ③an ④／ ⑤a ⑥／
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