问题:
The best times to visit Shangri-la are spring and autumn ___ the temperature is at its mildest.
A.where
B.on which
C.when
D.in that
The best times to visit Shangri-la are spring and autumn ___ the temperature is at its mildest.
A.where | B.on which |
C.when | D.in that |
参考答案: