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5．-Keep _____ in mind that you have to be home by 10 o'clock．
-OK，I will．（　　）

A．

B．

C．

this

D．

one

分析 -切記你必須在十點前回家．
-好，我會的．

解答答案：A．
考查指示代詞．題干部分是一個祈使句，keep的真正賓語是that you have to be home by 10o'clock，那么keep之后的空缺處應該是形式賓語，英語中可以做形式賓語的只有指示代詞it，故選A．

點評本題考查指示代詞it的用法．指示代詞it可以用作形式賓語，形式主語，可代替不定式、動名詞或從句．

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