选择题：Not until some students failed the exam __________how much time they had wasted.

题目内容：

Not until some students failed the exam __________how much time they had wasted.

A.they realized

B.did they realize

C.didn' t they realize

D.they didn' t realize

参考答案：

答案解析：

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When __________is produced, complete closure of the articulators is involved so that the air stream

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分类：教师资格题型：选择题