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把下面的定语从句和同位语从句改为不定式短语 Before the machines leave the factory, there is a series o

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把下面的定语从句和同位语从句改为不定式短语 Before the machines leave the factory, there is a series o

把下面的定语从句和同位语从句改为不定式短语

Before the machines leave the factory, there is a series of tests that must be passed.

试题答案

答案:

解析:

Before the machines leave the factory, there is a series of tests to be passed/to pass.