She spends half an hour doing her homework .(改为同义句)She spends half an hour —————— —————— ——————.
问题描述:
She spends half an hour doing her homework .(改为同义句)
She spends half an hour —————— —————— ——————.
答
on her homework
spend ...on sth = spend ... doing sth 固定用法
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答
She spends half an hour 【on her homework】.