They love their daughter so much that they are ready to do everything they can __ her happiness.A:to make sure of B:to be sure of

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They love their daughter so much that they are ready to do everything they can __ her happiness.A:to make sure of B:to be sure of

They love their daughter so much that they are ready to do everything they can __ her happiness.A:to make sure of B:to be sure of
They love their daughter so much that they are ready to do everything they can __ her happiness.
A:to make sure of B:to be sure of

They love their daughter so much that they are ready to do everything they can __ her happiness.A:to make sure of B:to be sure of
A to make sure of
to make sure表示目的
make sure 是词组 确保
make sure of 加名词
be sure确信

A: to make sure of

选A。

选 to make sure of
这里要用一个动词不定式来表示目的,be表状态,不合适,make sure of 是个动词词组,表动作。