Chinese scientists have produced an embryo of a giant panda through cloning technology,_____ is a breakthrough ______ could save the endangered animals.
#67247
A
that; which
B
which; that
C
which; what
D
that; what
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_______ difficult and challenging the task may be, we must finish it on time, because there is a possibility _______our work will go down in history.
#67717
A
Whatever; that
B
However; as
C
Whatever; which
D
However; that
I would appreciate it ________ you call back this afternoon for the doctor's appointment.
#67449
A
until
B
if
C
when
D
that
My sister isn’t in. ________ she comes back, I’ll let her call you back.
#41346
A
While
B
Until
C
Before
D
When