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17、The country has already sent up three unmanned spacecraft,the most recent ________ at the end of last March.

A.has been launched                             B.having been launched

C.being launched                                    D.to be launched

17、B

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The country has already sent up three unmanned spacecraftthe most recent ________ at the end of last March.

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科目:高中英语 来源: 题型:

The country has already sent up three unmanned spacecraft,the most recent ________ at the end of last March.

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