问题

The country has already sent up 3 unmanned spacecraft, the most recent at the end of last March.

A:was launched
B:being launched
C:has been launched
D:having been launched

正确答案是：

同类题型

When I met him the other day, it was the first time we _____ each other since we were at school.[ ]

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summer rain, the rainbow looks more beautiful ____ a blue sky.

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