9．_______ is very dangerous to swim alone in the river．（　�。�
A．ItB．ThisC．That

分析 獨自一人在河里游泳是很危險的．

解答 答案A 根據(jù)It is+形容詞+to do sth．做某事怎么樣，it為形式主語，動詞不定式才是真正的主語．故選：A．

點評 解決形式主語的題目，做題時，要理清句子的意思以及形式賓語所指代的內(nèi)容，平時記住一些固定句型，有助于提高答題的準確率．

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