Could anyone help me with this excercise??

Dear Student,

Here are your answers - 
1. A. must have given up
B. couldn't have done that, might have gone
2. A. might have left
B. must have stepped out
3. A. couldn't have committed
B. could, had instructed
4. A. might have found
B. might have won
5. A. must have forgotten
B. must have known


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