题目内容
第一节 单项填空
从[A]、[B]、[C]、[D]四个选项中,选出可以填人空白处的最佳选项,并在答题卡1上将该项涂黑。
21.It is an exciting moment for Chinese people this year, ____for the first time the O-lympic Games will be held in China.
[A] that
[B]while
[C] which
[D] when
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