He is always busy, so I don’t care________________________(他是否有空) this Sunday.

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问题 He is always busy, so I don’t care________________________(他是否有空) this Sunday.

选项

答案whether or not he is free/whether he is free or not

解析 本题的考查点是“是否”的表达方式用whether of not,注意if不能用于此种结构。
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