I spent half an hour_______my book.
问题描述：
I spent half an hour_______my book.
答
on
spend some time or money on something
spend time (in) doing something
答
reading or on
答
填介词on
答
reading
spend time (in) doing sth.
spend time on sth.
答
介词填on
动词填 reading
spend... on sth.
= spend.. doing sth.
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答
on
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答
用动名词的形式V+ing