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James has just arrived,but I didn't know he__until yesterday.A was coming Bhad been comingA还是B,

题目详情
James has just arrived,but I didn't know he__until yesterday.A was coming Bhad been coming
A还是B,
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答案和解析
本题我认为选择A.先分析后半句,until yesterday这一部分是跟着I didn`t know的,译为我直到昨天才知道他要来,注意:对于come,go,leave等词用动名词表示将来,而在当时看来,显然“他来”这件事是发生在将来的,故用is coming,而主句是过去式,所以从句往前面进一个时态,变成 was coming