It wasthe chief engineer camewe began the experiment.

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问题 It was______the chief engineer came______we began the experiment.

选项 A、not until; that
B、not until; then
C、until; that
D、until; when

答案A

解析直到总工程师来了，我才开始做实验。it is not until…that为强调句型，意思是“直至某时才做某事”。

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