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

—________.

When you have difficulty in learning, you can {#blank#}1{#/blank#} your teachers {#blank#}2{#/blank#} help.

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