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(E)A为何不对?during the first six months of this year时态为何不用过去完成时? A为何不对?during the first six months of this year时态为何不用过去完成时?
[此贴子已经被作者于2006-9-30 10:36:39编辑过] |