The patient's son asked the doctor the question________his father could survive the big operation.
#32129
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whether
B
if
C
that
D
what
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—When did your cousin begin to show his interest in medicine?—It was a Saturday ___ she noticed her uncle experimenting on a frog in his lab.
#34174
A
that
B
what
C
when
D
which
Remember that there is still one point ______ we must make clear at the conference tomorrow.
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where
B
why
C
when
D
that
Mark needs to learn Chinese ______ his company is opening a branch in Beijing.
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unless
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until
C
although
D
since
During the 1950s，R&.B changed modern music further and led to＿＿＿＿we know as rockand roll.
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as
B
what
C
that
D
which