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题型：单选题题类：常考题难易度：普通

仁爱科普版九年级上Unit 1 The Changing WorldTopic 1 Our country has developed rapidly. 语法专题练习：现在完成时

We have been friends _______.

A、for two years ago B、since two years C、for two years D、in two years ago

举一反三

There have been no buses _______ half an hour.

Kris 加入发明俱乐部已经三年了．

Kris has been in the Invention Club{#blank#}1{#/blank#}．

Peter has studied in this school ________.

More than 20 people, _______ in traffic accidents _______ last May.

since; for

Li Ming ____ the book for many years since he ____ it as a prize in the competition.

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