2. 外语
  3. Hardly ______ when a loud explosion was heard.

Hardly ______ when a loud explosion was heard.

admin2011-02-26  45
问题 Hardly ______ when a loud explosion was heard.
选项 A、the train had started
B、the train had been started
C、had the train started
D、did the train start
答案C
解析
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