Although everything seems to have been t
题型:选择题
问题:
Although everything seems to have been taken into consideration, ______ accident can happen when
the astronauts walk in ______ space. [ ]
A. /; the
B. an; the
C. the; the
D. an; /
Although everything seems to have been taken into consideration, ______ accident can happen when
the astronauts walk in ______ space. [ ]
A. /; the
B. an; the
C. the; the
D. an; /