Stephen Hawking has expressed his opinion   ___ humans might one day be able to make spaceships capable of such speeds that time on board would slow down．
A．thatB．whomC．whichD．what
A
考查名詞性從句。句中考查that引導(dǎo)的同位語從句，解釋說明名詞his opinion，在句中不作任何成分，故選A。
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