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2． Interest rates on mortgages have declined steadily during the first six months of this year but virtually remained unchanged during the next three months.

A) have declined steadily during the first six months of this year but virtually remained unchanged

B) declined steadily during the first six months of this year but virtually remain unchanged

C) steadily declined during the first six months of this year but remain virtually unchanged

D) declined steadily during the first six months of this but have remained virtually unchanging’

E) declined steadily during the first six months of this year but have remained virtually unchanged

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更正自己的错误, 昨晚昏了头.

这里选E,

动词和副词的位置应该一致declined steadily    和  remained virtually, 以此来作第一步排除。A, B, C;

D unchanging意思错，remain unchanged表一结果状态，应用-ed。

时态: during the next three months.无法表现出现在/一般的意味, 故一般时错。

6 months是在3 months之前的一个时间段, 3 months是延续到现在的时间段, 6 months在它之前只能用过去时。