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题型：单选题题类：常考题难易度：容易

不定冠词：表示“每一”，相当于every

There are four seasons in year and they are distinct.

A、the B、an C、a D、/

举一反三

In order to find ________ better job, she planned to learn ________ second foreign language.

You can try_______ second time if you fail_______ first time.

____ old man behind Mary is _____ university teacher.

Tom and his sister are height.

This is an ______ book.

Mrs. Green usually goes shopping with ________________ umbrella in ________________ summer.

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