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

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

选项 A．first mark
B．be first marked
C．have first marked
D．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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