题目内容

______ the time Brian arrives at the airport, Tony has already been waiting there.

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Combine the following pair of sentences , using “it” for a subject clause.

外毛细胞会改变内毛细胞的敏感性。()

A. 对
B. 错

等他到机场时,飞机已经起飞了。( by the time)

在校园里,车速被限制在每小时10英里。( be limited to)

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