Some astronauts to the space station and they haven’t returned yet.

A. have gone B. has gone

C. have been D. has been

A 【解析】句意：一些宇航員已經(jīng)去太空站了，他們還沒有回來。根據(jù)語境可知，本句表示過去的動作對現(xiàn)在造成的影響或結(jié)果， 所以使用現(xiàn)在完成時態(tài)，has/have+動詞的過去分詞。have /has been to意為“去過某地”，人已不在那里（某地）；have /has gone to意為“去了某地”，人不在說話地點(diǎn)。some astronauts在句中作主語，復(fù)數(shù)含義，所以借助助動詞have。...
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