问题

If you are traveling_______the customs are really foreign to your own, please do as the Romans do.

A:in which
B:what
C:when
D:where

正确答案是：

同类题型

ty ________ 6 billion yuan to preserve the character of the old town, mainly to divert water from the Taihu Lake and the Yangtze River to supply the waterway systems of the old town

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