高中英语反义疑问句These trees must have been planted three years ago,____?A.weren't they B.mustn't they C.didn't they D.haven't they为什么不选D?

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高中英语反义疑问句Thesetreesmusthavebeenplantedthreeyearsago,____?A.weren''ttheyB.mustn''ttheyC.didn''ttheyD.hav

高中英语反义疑问句These trees must have been planted three years ago,____?A.weren't they B.mustn't they C.didn't they D.haven't they为什么不选D?
高中英语反义疑问句
These trees must have been planted three years ago,____?
A.weren't they B.mustn't they C.didn't they D.haven't they
为什么不选D?

高中英语反义疑问句These trees must have been planted three years ago,____?A.weren't they B.mustn't they C.didn't they D.haven't they为什么不选D?
答案是C.
must have done 是对发生在过去时间段事情的推测,从句中three years ago也可以看出这一点.因此,反问时,要用过去时.即：These trees were planted three years ago.

选C，这些树肯定种于三年之前，ago表示过去，因此用过去式表示。

答案选C, 理由同 “朵朵可爱特别多”，
不选D, 因为只有助动词have 表示完成时态时，用have来构成反义疑问句，这个句子不表示完成时态，而是用 情态动词+have done 表示对过去的肯定的推测

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