单选题
交通银行
2015-12-10
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
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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