________ is impossible for us to offer him any help.
A．ThisB．ItC．ThatD．which
B

試題分析：考查it用法，it做形式主語，句子意思“我們給他提供任何幫助是不可能的”
點評： it用法是近幾年高考的熱點，需要考生知道它是形式主語還是形式賓語，進而作出正確的判斷。
即學即練：--- is important that we shuold study hard
A. This          B. It           C. That        D. which
選B  句子意思“我們刻苦學習很重要”
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