John has just left New York, but I did not know he until yesterday.

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问题 John has just left New York, but I did not know he      until yesterday.

选项 A、will leave
B、had been leaving
C、leaves
D、was leaving

答案D

解析 本题是but所联结的两个并列句。在did not know后面的he until yesterday是know的宾语从句。在宾语从句中,可用一般时或进行时表将来。这里是用过去进行时表过去将来。
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