2. 外语
  3. It was______the chief engineer came______we began the experiment.

It was______the chief engineer came______we 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 原文：直到总工程师来了，我们：才开始做实验。考查not until的强调句形式。not until…that是固定搭配，表示“直到……才”，强调形式为it is／was not until…that…，故答案为A。
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