Johan didn’t review(复习) the lesson, ___ he couldn’t answer the teacher’s question.
#58129
A
as a result
B
such as
C
because of 
D
as well as
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He had to retire(退休)early         poor health.
#56910
A
as a result
B
because
C
so
D
because of
_____ it is raining, _____ he is still working outside. 
#56291
A
Although; but
B
Although; /
C
But; although
D
/; although
Mother keeps telling her son not to get off until the bus          .
#55396
A
will stop
B
is going to stop
C
stopped
D
stops