问题

All the guests at the party were dancing and singing happily _____ the electricity was cut off.

A:until
B:while
C:when
D:because;

正确答案是：

同类题型

As we all know, China has a great many cultural heritages, attract people from all over the world to learn about China.

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s Apple’s attitude toward the matter―Apple does not look into the matter directly, ______