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题型：单选题题类：模拟题难易度：普通

-- You're dropped __________ “s” in the word “across”.
-- Oh, you are right, __________ letter “s” should be doubled like this “cross”.

A、a, a B、an, a C、an, the D、the, a

举一反三

— Do you often play _____ piano?

— Yes. I want to be _____ musician like Lang Lang.

—Do you know _______ young man under the tree?
—Yes, but only a little, maybe he is _______ university student.

The plane will arrive in Haikou in half ______ hour.

一Is this old mountain?

一Yes．But some villagers still live in mountain．

— Is Yi Jianlian NBA player?

— He used to be. But now he plays for Guangdong Southern Tigers in CBA.

I have(有) {#blank#}1{#/blank#} (a/an)English book.

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