GWD-TN-12 T-4-Q30 求助

T-4-Q30

Unlike the short flights of the shuttle and earlier
spacecraft, which carried sufficient power in fuel cells and batteries, a
permanently orbiting space station will have to generate its own electricity.

A.   
the short flights of the shuttle and earlier
spacecraft, which carried sufficient power in fuel cells and batteries

B.   
the shuttle and earlier spacecraft, with
sufficient enough power in fuel cells and batteries for their short flights

C.   
the short flights of the shuttle and earlier
spacecraft, which enabled them to carry sufficient enough power in fuel cells
and batteries

D.   
the shuttle and earlier spacecraft, which were capable
of carrying sufficient power in fuel cells and
batteries for their short flights

E.    
the flights of the shuttle and earlier
spacecraft, whose shortness allowed them to carry sufficient power in fuel
cells and batteries