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843.I am not going to sit here and let her abuse me.I demand that she immediately _____ for what she just said.
A.apologize
B.would apologize
C.apologized
D.must apologize
844.Great efforts to increase increase grain production _____ if food shortages are to be avoided.
A.could be made
B.must be made
C.might be made
D.would be made
