2. 外语
  3. Not until recent years ______ a popular means of communication.

Not until recent years ______ a popular means of communication.

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问题 Not until recent years ______ a popular means of communication.
选项 A、e-mail became
B、e-mail has become
C、did e-mail become
D、will e-mail become
答案C
解析 本题测试倒装句的用法。句首为否定词或否定意义的词语时，常用部分倒装(有时要借助助动词do等)。本句句首为not until，所以要使用部分倒装。这样表示否定的词或词组主要有：hardly，little，never，by no means，no sooner等。所以首先要排除A和B；其次根据信息词recent years判断句子不能用将来时，故答案为C
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