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题型：语法填空（单句）题类：常考题难易度：普通

北师大版（2019）高中英语必修第三册Unit 7 Lesson 1

Before a problem can be solved, it must be obvious the problem itself is.

举一反三

It suddenly occurred to him he had left his keys in the office.

They lost their way in the forest, and ________ made matters worse was that night began to fall.

{#blank#}1{#/blank#} is a pity that the industrial cities built in the nineteenth century do not attract visitors.

_______ in the regulations that you shouldn't tell other people the password of your e-mail account.

Some people believe _______ has happened before or is happening now will repeat itself in the future.

It is uncertain {#blank#}1{#/blank#} side effects the medicine will bring.

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