问题

_____ the majority of people you will meet when travelling are sure to be friendly, there are dangers-theft being the most common

A:Since
B:Unless
C:While
D:Once

正确答案是：

同类题型

I don’t want to go to the museum, because it’s too_______.

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The new tax would force companies to __________energy-saving measures

When did it start —_________.

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