Up to now，55 B eiDou satellites
have been sent
have been sent
（send）into space，meaning the completion of China's self-developed BeiDou Navigation Satellite System.

【考點】現在完成時．

【答案】have been sent

【解答】

【點評】

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發(fā)布：2024/4/20 14:35:0組卷：3引用：1難度：0.9

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A．entered	B．have entered
C．enter	D．are entering

Up to now，55 B eiDou satellites have been senthave been sent（send）into space，meaning the completion of China's self-developed BeiDou Navigation Satellite System.