— No one can answer the question _______ we can complete the task in time, do you know?
— Yes, and this is because we don’t know the way _______ the scientist used last time．
A．whether; which B．if; which
C．whether; in which D．if; in which
— No one can answer the question _______ we can complete the task in time, do you know?
— Yes, and this is because we don’t know the way _______ the scientist used last time．
A．whether; which B．if; which
C．whether; in which D．if; in which
A