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题型：单选题题类：常考题难易度：普通

北京市101中学2018-2019学年高一上学期英语期中考试试卷

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

A、whether B、when C、why D、how

举一反三

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

_______ are playing an important part is well known to us all.

_______ made the school proud was ______ more than 90% of the students had been admitted to key universities.

________ has been proved is that animals and insects have their own languages.

{#blank#}1{#/blank#}impressed me most in my senior high school life was the friendship among classmates.

____________ the delayed flight will take off depends much on the weather.

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