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He was so busy that _____ I could say hello to him he had rushed out of the room.

A. when
B. before
C. since
D. until
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科目:高中英语 来源:0123 月考题 题型:单选题

He was so busy that _____ I could say hello to him he had rushed out of the room.
[     ]
A. when
B. before
C. since
D. until

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科目:高中英语 来源: 题型:

He was so busy that _____ I could say hello to him he had rushed out of the room.

       A.when         B.before         C.since D.until

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