We had to wait in line for 30 minutes because only a few clients were allowed in______.

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问题 We had to wait in line for 30 minutes because only a few clients were allowed in______.

选项 A、at one time
B、at all times
C、at certain times
D、at no time

答案A

解析 这是一道词组题,考点是相近词组意思的辨析。
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