Although everything seems to have been taken into consideration, ____ accident

题干

Although everything seems to have been taken into consideration, ____ accident can happen when the astronauts walk in _____ space．

A．不填；the

B．an；不填

C．the；the

D．an；the

上一题下一题 0.64难度单项选择更新时间:2013-03-03 09:56:15

小学学科试题库

初中学科试题库

高中学科试题库