— Would you like to share your opinion with us?  — Ok. Mary is studying harder than before, ____ everyone can see.
#71754
A
because
B
which
C
that
D
as
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We stayed in a quiet hotel,__    _.
#69263
A
next to it was a thick wood
B
next to which was a thick wood
C
next to it there was a thick wood
D
next to which a thick wood was
He tried his best to solve the problem,     difficult it was.  
#66875
A
no matter what
B
whatever
C
however
D
how