We have four classes ______ the morning.
#47349
A
of
B
at
C
on
D
In
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Sally has been swimming ______ four hours.   
#50710
A
for about
B
since
C
about
D
/
_____ end of May, we will finish _____lessons. 
#47284
A
At the; to learn
B
At; learning
C
At the; learning
D
At; to learn