The astronauts found that ______ the spaceship went further and further into space, it became more and more difficult to control its own movements.
A．ifB．tillC．a(chǎn)sD．while
C
連詞詞義辨析。宇航員發(fā)現(xiàn)隨著飛船深入太空控制它的運動越來越難。As表時間意為“隨著”
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