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【题目】I have to take out the trash (two) a week.

【答案】twice
【解析】twice a week:每周两次。也可以说twice weekly。haveto是情态动词,词性上等同于must,但是意义上有所不同;must是应外界的要求而必须做,haveto是自己主动觉醒,意识到自己不得不做。
故填twice。

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