【題目】 _________________ is important _________________ us to do morning exercises every day.

A. That；for B. It；for C. This；of D. It；of

【答案】B

【解析】It’s＋adj.＋for sb. to do sth.是一個(gè)固定句型，It用作形式主語，真正的主語是后面的不定式結(jié)構(gòu)。故選B。

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