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  3. They left at nine, so they______by now.

They left at nine, so they______by now.

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问题 They left at nine, so they______by now.
选项 A、may arrive
B、must arrive
C、should have arrived
D、ought to arrive
答案C
解析 should have arrived by now“现在应该已经到达了”；should have+过去分词用于判断，表示说话时某人应该已经做了某事；也可表示“本来应该已经做了某事”(但实际上并未做)，含有责备之意。
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