问题
选择题
The astronauts found that ______ the spaceship went further and further into space, it became more and more difficult to control its own movements.
A．if
B．till
C．as
D．while
答案
答案：C
连词词义辨析。宇航员发现随着飞船深入太空控制它的运动越来越难。As表时间意为“随着”