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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

Look! It is _______ CD. It's ________ CD.

- What do you know about kite surfing?

- It is _________ exciting water sport.

Many people don't always see things in same way so they may describe same person differently.

This is ________ apple.

—You see, it's my dream to buy__________iPhone X.

—Oh, you can ask your parents to buy __________for you.

Matt has got _____ electronic dictionary, but it isn't allowed to use during the exam.

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