问题
选择题
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.that
B.whom
C.which
D.what
答案
答案:A
考查名词性从句。句中考查that引导的同位语从句,解释说明名词his opinion,在句中不作任何成分,故选A。