Mother's Day is thought to __________in the 19lOs, isn't it?
2023-08-04
A.first mark
B.be first marked
C.have first marked
D.have first been marked
参考答案:D
B.be first marked
C.have first marked
D.have first been marked
参考答案:D
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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