I believe we must think again about ________ Pro Cook said at the meeting.
A. that
B. what
C. which
D. /
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Could you please tell us ________ two computers are the cheapest among these?
A. which
B. what
C. that
D. whether
______ you have done things like that before doesn’t matter.
A. That
B. Whether
C. What
D. If
Now there is a danger ______ the area pollution kills all the plants here.
A. if
B. whether
C. /
D. that
Father made a promise ______ he was free he would take us to the Great Wall.
A. that
B. if
C. that if
D. whether