They love their daughter so much that they are always ready to do everything they can ________ her happiness.
| A．to make sure of | B．make sure of |
| C．be sure of | D．to be sure of |
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They love their daughter so much that they are always ready to do everything they can ________ her happiness.
| A．to make sure of | B．make sure of |
| C．be sure of | D．to be sure of |
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