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题型：单选题题类：模拟题难易度：普通

Jack felt nervous when he found the physics problems ____ to work out.

A、easy enough B、too easy C、too difficult D、difficult enough

举一反三

A _____ is a person who is in someone's home by invitation, for a short time, as for a meal, or to stay one or more nights.

They agreed _______ on a picnic on a sunny day.

我奶奶对智能手机不感兴趣。

My grandma{#blank#}1{#/blank#} smart mobile phones．

该吃午饭了，咱们去餐厅吧。(完成句子)

{#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} lunch. Let's go to the dining hall.

We will try our best w {#blank#}1{#/blank#} we are successful or not．

—What do you think of the new bridge?

—I have never seen ________ before.

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