Earth Day is a reminder__we need to care about the world we live inand__we should learn to respect life and nature.A.that;that B which;which C that;what D which;what为什么选A

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Earth Day is a reminder__we need to care about the world we live inand__we should learn to respect life and nature.A.that;that B which;which C that;what D which;what为什么选A
Earth Day is a reminder__we need to care about the world we live in
and__we should learn to respect life and nature.
A.that;that B which;which C that;what D which;what
为什么选A

Earth Day is a reminder__we need to care about the world we live inand__we should learn to respect life and nature.A.that;that B which;which C that;what D which;what为什么选A
同位语从句必须用that
reminder以后的内容,都是reminder的解释,是reminder的同位语,所以用that引导

而且句子成分前后都充分了啊..
不能再加什么了