Question

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

Answer 1

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”