In this technological era once took a century now only takes a month.A．whi
题型：不详难度：来源：
In this technological era once took a century now only takes a month.| A．which | B．that | C．when | D．What |
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答案
| D |
解析
| 考查名词性从句。what once took a century now 做takes的主语，是主语从句。从句中缺少took的主语，故选what。 |
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