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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 ofB.make sure of
C.be sure ofD.to be sure of
A
make sure of确保;be sure of确信,对……有把握。句意:他们如此爱他们的女儿以至于他们总是愿意做他们能做的一切来确保她的幸福。所以选A,不定式作目的状语。
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