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单选题
54.James has just arrived, but I didn’t know he（ ）until yesterday.
A
A.will come
B
B. was coming
C
C. had been coming
D
D. came
答案解析
正确答案：B
解析：
詹姆斯刚到，不过我直到昨天才知道他要来。本句是在过去时间里(昨天)看将来动作(詹姆斯要来)，应用过去将来时。因为 come/leave 一类动词的进行时可以表将来，was coming 表达的就是过去将来时，B 正确。will come 和came 的时态明显错误。had been coming 是过去完成进行时，表示一个动作一直持续到过去某个时间，尤其强调与一个过去动作相比时间上更为靠前，用于这个时态的动词都是持续性动词，瞬间动词come 不能用于此处，其次，“他来”这个动作一直持续到昨天，与句意不合。
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