Last term our maths teacher set so difficult an examination problem _____ none of us worked it out.
#71998
A
that
B
as
C
so that
D
which
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(2013·山东卷)There is no simple answer，________is often the case in science.
#66743
A
as
B
that
C
when
D
where
We finally bought several books by Shakespeare, ______ is one.
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A
which of them
B
which of whose
C
of which this
D
and of them
Government reports,legal papers and most business letters are the main situations________English is used.
#72715
A
when
B
that
C
how
D
where
The people, ________ had been damaged by the flood, were given help by the Red Cross.
#73309
A
all whose homes
B
all of whose homes
C
all their homes
D
all of their homes