Climbing Mount Tai           great skills and           not without risk.
#102025
A
requires; is
B
required; was
C
required; are
D
required; were
推荐题目
I’m terribly sorry for being late, but I _____ the wrong bus.
#104116
A
catch
B
had caught
C
caught
D
catching
-When ____ you return the dictionary to me?-Only when I ____ you next Sunday.
#104676
A
will;see
B
do;will see
C
will;will see
D
do;see
Great changes _____ in China in the past 30 years and many Chinese are living a happy life today. 
#99354
A
took place
B
were taken place
C
have taken place
D
have been taken place