—_________is very interesting to swim in the river in summer,but it’s dangerous.

A．ThisB．ThatC．ItD．He

C

解析試題分析：句式：It is adj to do sth做某事怎么樣。本結構中it做形式主語，指代下文不定式內容，其它選項無此用法。故選C。
考點：不定代詞用法
點評：不定代詞的應用是初中英語考察的重點，熟記每個代詞的用法，解題時結合語境具體分析，選擇正確答案。

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