大全—最新题－18，非常奇怪！

18.   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）

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

这题主要考时态与时间状语during的搭配。我在朗文上during的例句都是用一般过去时，没有现在完成时的，所以我选B。可答案选E，有谁知道为什么吗？

在今年的前半年 利率下降 是过去的事情 用一般过去时

利率会持续 是发生在过去 即今年的上半年 持续到后三个月 所以用现在完成时

E对

而B 用一般现在时 表示事实 与意思不符合

另外 during 没有定论一定要用在过去时还是完成时 要根据句意来判断

1, remain是but后的主动词，而不是unchanged，unchanged仅仅是个形容词，所以，B用一般现在时的remain当然是错的, agree.

2. 另：B和C的表达其实是完全一样的。disagree. In B, virtually 修飾 "remain:; in C, virtually 修飾 "unchange". Obviously C is better than B in this aspect.