题目内容
9．-How many Chinese astronauts （宇航员） ________ into space since 2003？-Twelve，including two women．（ ）
| A． | were sent | B． | sent | C． | have been sent | D． | have sent |
分析 ---从2003年起有多少中国宇航员被送入太空．---12位，包括2名女性．
解答 答案：C．由since 2003可知，从2003年到现在表示一段时间，时态需用完成时而不是过去时．根据常识，可知宇航员是"被送上太空"，所以用同时需要用被动语态．因而，句子需用到的时态为现在完成时的被动语态，故选C
点评 此题应根据所给时间状语和句子的主语与动词之间的关系去选择．
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