They left three hours ago; they ______ there by now.

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问题 They left three hours ago; they ______ there by now.

选项 A、must arrive
B、can arrive
C、must have arrived
D、will arrive

答案C

解析 本题考查情态动词的用法。该句意为“他们是三个小时之前离开的,现在他们一定到那里了”。must表示说话者肯定性的语气,同时用完成时表示事情已发生,因此C项为正确答案。
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