Radiocarbon dating of fossils taken from caves on islands along southeastern Alaska's coast suggest that at least a portion of the area was remaining ice-free during the last ice age.
(A) suggest that at least a portion of the area was remaining
(B) suggest at least a portion of the area remaining
(C) suggests that a least a portion of the area remained
(D) suggests at least a portion of the area that had remained
(E) suggests at least a portion of the area to have remained
during the last ice age不是完成时的代表吗？为什么答案是C 过去时态呢 求解？？？
作者: superbat28 时间: 2011-10-2 09:03
during the last ice age不是完成时标志。 完成时标志是：during+ the past/ last + 一段时间(比如ten years, two months等) 三者缺一不可。