The astronauts found that ______ the spaceship went further and further into space, it became more and more difficult to control its own movementsA.ifB.tillC.asD.while
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C解析试题分析：句意：宇航员发现随着宇宙飞船更远地进入太空时，它变得越来越难控制它的运动轨迹。这里that引导的是宾语从句。这个宾语从句是复合句，逗号后是主句，as the spaceship went further and further into space 是从句。A. if如果； B. till直到； C. as随着； D. while当……时候。根据句意故选C。考点：考查连词的用法。