2. 外语
  3. The clerk can then use his sense of hearing to monitor the success of his inputs______he keeps his eyes on the document.

The clerk can then use his sense of hearing to monitor the success of his inputs______he keeps his eyes on the document.

admin2012-09-13  14
问题 The clerk can then use his sense of hearing to monitor the success of his inputs______he keeps his eyes on the document.
选项 A、until
B、since
C、while
D、during
答案C
解析
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