题目内容
19.Itis/has been years since much useful information was sent back to earth through the satellite.(be)分析 这个卫星已经多年没有往地球发送大量的有用的信息了.
解答 答案是is/has been.本题考查时态;题干中考查了句型"It is/has been+段时间+since从句";since从句中用过去时;如果since从句中的动词是延续性动词,表示"不再做…已经有…(时间)";如果since从句中的动词是瞬间动词,则表示"自从…已经有…(时间)";故根据语义和结构判断答案是is/has been.
点评 本题是要求用所给动词的适当形式填空,解题时首先考虑句中需要的是谓语动词还是非谓语动词;其次,如果是谓语动词关注时态、语态和数的变化;如果是非谓语动词要联系非谓语的基本用法判断非谓语的形式.
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