It's my great honor ______ to give a speech at the opening ceremony.
#17058
A
to invite
B
inviting
C
having invited
D
to be invited
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They found there was_____ to weigh such an elephant.
#15968
A
big enough nothing
B
nothing enough big
C
enough nothing big
D
nothing big enough
 —_______ do you have a sports meet at your school?—Once a year. 
#56937
A
How soon
B
How often
C
How long
D
What time