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  3. --They are supposed to arrive at six, but there is still no sign of them.--Something unexpected ______ to them.

--They are supposed to arrive at six, but there is still no sign of them.--Something unexpected ______ to them.

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问题 --They are supposed to arrive at six, but there is still no sign of them.--Something unexpected ______ to them.
选项 A、might happen
B、must have happened
C、would have happened
D、could happen
答案B
解析
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