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 |
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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 |