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题型：单选题题类：模拟题难易度：容易

More historical buildings in the old town will fall down ________we try our best to protect them.

A、if B、since C、unless D、in order that

举一反三

The actor was happy that he got a part in the movie, _____ the part was a small one .

In the past, most children couldn't go to school poor economy（经济）.

No one is late today, _______ it's raining hard.

I won't go to bed {#blank#}1{#/blank#} I finish my homework. (填连词)

You do not win respect by showing __________ you are, but what you're able to do.

—When did you realize your pet dog was not with you?

—______ I arrived home.

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