作业帮he spends more than an hour ex
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he spends more than an hour exercising everyday.
为什么是exercising，是不是spend后面要接动词ing形式？
为什么是exercising，是不是spend后面要接动词ing形式？
解题思路： spend的主语必须是人， 常用于以下结构： (1) spend time ／money on sth. 在„„上花费时间（金钱）。例：I spent two hours on this maths problem. 这道数学题花了我两个小时。 (2) spend time ／ money (in) doing sth. 花费时间（金钱）做某事。例：They spent two years (in) building this bridge. 造这座桥花了他们两年时间。 (3)spend money for sth. 花钱买„„。例：His money was spent for books. 他的钱用来买书了。
解题过程：
spend ...doing ...
解题过程：
spend ...doing ...
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