All telemarketers should return to work______the cause of the phone line malfunction is determined and repaired.

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问题 All telemarketers should return to work______the cause of the phone line malfunction is determined and repaired.

选项 A、once
B、or
C、while
D、yet

答案A

解析根据选项得知此题为选择恰当的连词的问题。通过分析句子，空格处应填入意为“一旦做……”的连词。

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