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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

"There is ______ in today's newspaper, so you needn't read it," the father says to his son.

John would rather __________ emails to friends while Jack prefers __________ phone calls.

It is difficult _______ us _______ the charity work without your help.

—Do you want {#blank#}1{#/blank#} (go) there with me?

—Yes, I do.

Hurry up! We must get to the bus stop {#blank#}1{#/blank#} time, or we will be late for school. (填介词)

Doing exercise is good ______ our health.

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