they will go back () A after half an hour B in half an hour

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they will go back () A after half an hour B in half an hour
they will go back () A after half an hour B in half an hour

they will go back () A after half an hour B in half an hour
答案:
【B in half an hour】
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B
in +时间(....时间后)用将来时态
after+时间(....时间后)用过去时态。

B
IN + 一段时间,常与一般将来时连用。而A 不与将来时连用。
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