_____________ the Games will be held in Beijing is not known. 
#4991
A
Whenever
B
If
C
Whether
D
That
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He is_______to have come back from the abroad.
#4799
A
possibly
B
possible
C
probable
D
likely
He apologized for _____.
#4530
A
his not being able to come
B
his being not able to come
C
his being able not to come
D
him not being able to come