He let me repeat his instruction ________ sure that I understood what was ________ after he went away.

1. A.
   to make; to be done
2. B.
   making; doing
3. C.
   to make; to do
4. D.
   making; to do

He let me repeat his instruction ________ sure that I understood what was ________ after he went away.

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A．to make; to be done

B．making; doing

C．to make; to do

D．making; to do

He let me repeat his instruction ________ sure that I understood what was ________ after he went away.

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