It was not until I ______ your letter that I ______ all about the matter.

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问题 It was not until I ______ your letter that I ______ all about the matter.

选项 A、have read; knew
B、would read; had known
C、read; had known
D、had read; knew

答案D

解析 Not until 用否定句,“直到……,直到……才”,例:It was not until he told me that I knew it 因为是过去时,所以条件句应比过去时更向后推,用过去完成时。
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