题目内容
The best times to visit Shangri-la are spring and autumn ____ the temperature is at its mildest.
A.when | B.where | C.that | D.which |
A
解析
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题目内容
The best times to visit Shangri-la are spring and autumn ____ the temperature is at its mildest.
A.when | B.where | C.that | D.which |
A
解析