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    7、 (2011年日照市调研考试)I don’t know how many years ago________people began to stay at home and civilization began.

    A．it was when                  B．it was that

    C．was it that                    D．was it when

    7、解析：选B。考查强调句型。句意：我不知道是多少年前人们开始呆在家中，文明由此开始。此句中被强调部分是how many years ago，去掉it was...that之后句子的正常语序是I don’t know how many years ago people began to stay at home and civilization began.。

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     (2011年日照市调研考试)I don’t know how many years ago________people began to stay at home and civilization began.

    A．it was when                  B．it was that

    C．was it that                    D．was it when

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