问题

ales must come up for air after several minutes, _______ a few can stay underwater for an hour or more

A:joined
B:has been in
C:has joined
D:had joined

正确答案是：

同类题型

down D【解析】试题分析：

下列各句中加横线成语的使用，全部正确的一项是（）

__________!There is a train coming.[ ]

Manyteensdon’tgetenoughsleepbecausethey have toomuch homework to do, which ____ themup at night. [ ]

I should very much like to have gone to the party, but ______.