It was not until the area was seriously polluted that they realized that it was high time to take action to stop pollution.

　　直到这个地方被严重污染了他们才认识到该采取行动阻止污染了。

　　夯实基础

　　用强调句型强调划线部分

　　I met him in the countryside last year.

　　(1)It was I that/who met him in the countryside last year.(强调主语)

　　(2)It was him that/who I met in the countryside last year.(强调宾语)

　　(3)It was in the countryside that I met him last year.(强调地点状语)

　　(4)It was last year that I met him in the countryside.(强调时间状语)

　　Ⅰ.单项填空

　　1．Although most of them have no doubt

　　he will pass the exam，I still wonder

　　he has really got everything ready.

　　A．whether；that

　　B．that；whether

　　C．that；that

　　D．whether；whether

　　答案　B

　　解析　句意为：虽然他们中的大部分人相信他能通过考试，但我依然想知道他是否做好了一切准备。doubt作名词用于否定句时，后接that引导的同位语从句；由句意知wonder后的宾语从句用whether引导。

　　2．

　　for his expert advice，John is often asked to help others with their personal affairs.

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