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题型：单选题题类：常考题难易度：普通

山东省日照市经济开发区中学2017年初中学业水平模拟试题

David didn't give up he had failed in the experiment four times.

A、if B、while C、though D、since

举一反三

________a clear day, people like to go out.

Susan and I have been friends five years.

—Where are you ________？

—China. I came here ________ my parents.

My bag is red and Mike's is blue, so mine is different _________his.

There is a river the two villages.

We ______ oxygen ______ the air and release (释放) CO2 into the air.

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