Mother\'s Day is thought to __________in

恬恬2019-12-17  14

问题 Mother's Day is thought to __________in the 19lOs, isn't it?

选项 A.first markB.be first markedC.have first markedD.have first been marked

答案D

解析考查动词时态和语态。to have done表示mark的动作发生在谓语动词think之前,句意为“母亲节最早被庆祝是在二十世纪头十年.不是吗 ”,故选D。
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