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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
参考答案
参考解析
解析：
句意：直到总工程师来我们才开始做实验。It was not until…that…直到…才…。
句意：直到总工程师来我们才开始做实验。It was not until…that…直到…才…。
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