It usually takes Tom about an hour to do his homework every day.改为同义句:
Tom usually ( spends ) about an hour ( doing ) his homework every day.
固定用法:
it takes sb some time to do sth 花费某人多长时间做某事。
= SB spends some time (in ) doing sth / on sth 某人花费多长时间做某事。
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Tom usually spends about an hour doing his homework every day.