问题详情：
is important us to do morning exercises every
day.
；for ；for ；of ；of
【回答】
B 点拨：It's＋adj.＋for sb. to do sth.是一个固定句型，It用作形式主语，真正的主语是后面的不定式结构。故选B。
知识点：简单句
题型：选择题
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