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题型：单选题题类：常考题难易度：普通

山西省曲沃中学校2015-2016学年高二下学期英语期中测试

Exactly ______ the potato was introduced into Europe is uncertain, but it was probably around 1565.

A、whether B、why C、how D、when

举一反三

________ the job takes a significant amount of time, most students agree that the experience is worth it.

I was about to leave _____ the telephone rang.

___ the plan has been made, let's get down to __ it out.

At school, some students are active ________ some are shy, yet they can be friends with one another.

Education has always been a hot topic among parents ______ it is directly related to the future of their children.

You should always exercise, ______ it's only ten minutes every day.

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