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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

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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