他花了一个小时写完那封信
He look an hour to write that letter.
或:
He took one hour to complete that letter.
或:
He took an hour to finish writing that letter.
或倒装语法:
That letter took him an hour to write.
He spent two hours finishing writing the letter.
It took him two hours to finish writing the letter.
It takes three hours for him to write the letter。
He spent an hour in finishing the letter.
He spent an hour writing letter.
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