单选题
中国银行
2016-05-06
All telemarketers should return to work __________the cause of the phone line malfunction is determined and repaired.
A.once
B.or
C.while
D.yet
参考答案
A
答案解析
f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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