As a teacher, I seldom give my students so difficult a problem_______ they can’t work out.
#67233
A
that
B
as
C
if
D
in order that
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We felt amazed at the use  the waste bottles.
#71625
A
they had made
B
they had made of
C
they had put
D
they had put to
I borrowed several books from the library, ________ are about English study.
#66982
A
two of them
B
and two of which
C
two of which
D
two of what