PP 80 (GWD-TN-24 Q33) 求助NN

xqjason

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 at 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
本题答案C，但是我有两个疑问：
1. during the last ice age是完成时的标志啊，为什么不用完成时？
2. Suggest that不是后面用虚拟语气的嘛？为什么可以用remained

我选择的是E，不知道错在什么地方，也请指正

cidisnotjayz

Ｅ不定式的使用没道理．
during＋时间在gmat语法中一般是过去时．．跟高中知识不一样，而且用完成时也应该用现在完成时比较好
ＡＢ主谓不一致．

xiaoxingyao

suggest用于建议的话才用虚拟语气should,During的话一般都用的是一般过去时

xqjason

谢谢了，suggest的问题灰墙好，确实是建议的时候才用虚拟语气

但是during没有错啦

within/during/over/in+the past/last/recent+时间短语 都是用现代完成时，白勇语法上有提