In January, 2004, the United States successfully launched “Spirit”, a Mars Exploration Rover, _____ a new milestone in the history of mankind.
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A
it marked
B
marking
C
marked
D
to mark
推荐题目
AIDS is said ______ the biggest health challenge to both men and women in that area over the past few years.
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A
that it is
B
to be
C
that it has been
D
to have been
Upon ________ his studies, he started travelling in China.
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A
finish
B
finishing
C
he finished
D
finished
The president is planning to increase the number of the students _________ to the university next year.
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A
to admit
B
to be admitted
C
admitting
D
being admitted
The lecture mainly deals with the trouble young children have _______ right from wrong.
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A
distinguished
B
distinguishing
C
to distinguish
D
to be distinguished