They spent half an hour (pack)their bags 用适当形式填空 过去完成时
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Theyspenthalfanhour(pack)theirbags用适当形式填空过去完成时Theyspenthalfanhour(pack)theirbags用适当形式填空过去完成时Theyspen
They spent half an hour (pack)their bags 用适当形式填空 过去完成时
They spent half an hour (pack)their bags 用适当形式填空 过去完成时
They spent half an hour (pack)their bags 用适当形式填空 过去完成时
packing
spend (in) doing
They spent half an hour packing (pack)their bags
spend .(in) doing sth.