选择题：Thestudentswaitedpatiently_____theresultswerebeing

题目内容：

The students waited patiently _____ the results were being distributed.
A、 if
B、 unless
C、 while
D、 since

参考答案：

There was a knock at the door again, and it was th

There was a knock at the door again, and it was the second time someone ________

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