问题
“Could you tell me______?”“ YesThey ____ to the library.”[ ]
A: where are the twins, have been
B: where were the twins, have been
C: where the twins are, have gone
D: where the twins were, have gone
B: where were the twins, have been
C: where the twins are, have gone
D: where the twins were, have gone
正确答案是：
