It sounds like something is wrong with the car’s engine. _____ , we’d  better take it to the garage immediately.
#31884
A
Otherwise
B
If not
C
But for that
D
If so
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In the final exam of last term, our maths teacher Mr.Wu gave us  ________we all couldn’t work out .
#33849
A
such a difficult problem that
B
so a difficult problem as
C
so difficult a problem that
D
as difficult a problem as