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单选题
It was ______ the chief engineer came ______ we began the experiment.
A
not until; that
B
not until; then
C
until; that
D
until; when
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参考解析
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”。
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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