for thousands of yesrs man dreamed ( )seemed impossible dreams about flying

问题描述:

for thousands of yesrs man dreamed ( )seemed impossible dreams about flying
A what B that C which D why
选哪一个?做什么成份,为什么是它``谢谢~

A
what seemed impossible dreams 这里what作主语,dreams 在这里是名词.似乎不可能的梦
几千年来,人们梦想着和飞行有关的那些似乎不可能的梦.