In January, 2004, the United States successfully launched “Spirit”, a Mars Exploration Rover, _____ a new milestone in the history of mankind. 
#98488
A
it marked
B
marking
C
marked
D
to mark
推荐题目
You were silly __________ your car, otherwise it wouldn’t have been stolen.
#91730
A
not locking
B
to not lock
C
not having locked
D
not to lock
 Please tell me the way you thought of ___ the garden. 
#98052
A
take care of
B
to take care of
C
taking care of
D
how to take care of