You__________buy a gift, but you can if

Freeti2019-12-17  12

问题 You__________buy a gift, but you can if you want to.

选项 A.mustB.mustn'tC.have toD.don't have to

答案D

解析根据句意你不一定(don’t have to)要买礼物,但是如果你想,你可以买。B项是禁止,易混淆,但不符合语境,故排除。
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