It ______ our teacher came that we began the examination.A、was untilB、is until

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问题 It ______ our teacher came that we began the examination.

选项 A、was until
B、is until
C、was not until
D、is not until

答案 C

解析本题考查“It is/was not until...that...”结构，意为“直到……才……”。因为that从句后使用了一般过去时，故选项C为正确答案。本题可改写为：We didn’t begin the examination until our teacher came．

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