Occasions are quite rare _____I have the time to spend a day with my kids.
#77906
A
who
B
which
C
why
D
when
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The river ____are covered with trees is very long
#76405
A
which banks    
B
of which banks
C
whose the banks  
D
the banks of which
The old professor has three sons,________are doctors.
#76978
A
all of them
B
all of whom
C
all of that
D
all of which